From 2027, the Singapore-Cambridge Secondary Education Certificate (SEC) records a student’s actual subjects and levels, with G3 grades A1, A2, B3, B4, C5, C6, D7, E8 and 9. When a post-secondary admission formula needs a grade at G2 level, SEAB maps a G3 grade of A1–B3 to G2 grade 1, B4–C6 to grade 2, D7 to grade 3, E8 to grade 4 and grade 9 to grade 5. Mapping is used only where the relevant admission calculation requires it. It does not turn a G3 subject into a G2 subject or replace the G3 grade printed on a student’s SEC certificate.
For a Posting Group 3 (PG3) family in Punggol, the most important distinction is between the result earned and the number used for a particular admission exercise. A student may hold a G3 English B4, G3 Mathematics A1 and G2 Chinese grade 5. Different pathways can use different subjects, eligibility requirements and aggregate formulas, so a family should not add all five numbers indiscriminately and announce that the child qualifies for every JC, polytechnic, PFP or ITE course. This guide explains the official mapping step by step, with examples and a practical checklist for 2027 SEC candidates and 2028 applicants.
Quick answers:
- PG3 means the admission Posting Group; G3 means the level of a particular subject under Full Subject-Based Banding.
- SEC starts in 2027 for the relevant graduating cohort; results are scheduled for January of the following year.
- G3 grading: A1, A2, B3, B4, C5, C6, D7, E8 and 9.
- G2 grading: grades 1, 2, 3, 4, 5 and 6.
- G1 grading: A, B, C, D and E.
- G3 A1/A2/B3 → G2 1; B4/C5/C6 → G2 2; D7 → G2 3; E8 → G2 4; 9 → G2 5, when an applicable aggregate requires the conversion.
- G2 grades 1–3 → G1 A; 4 → G1 B; 5 → G1 C; 6 → G1 D.
- G3 to G1: map the actual G3 grade to G2 first, then map that G2 grade to G1 if the admission formula requires it.
- No reverse guarantee: a G2 grade 1 is not transformed into an actual G3 A1 for admissions.
- 2028 admissions: MOE’s new Post-Secondary Admissions Exercise coordinates several routes, but each route retains eligibility and subject requirements.
Why a student may see two different numbers for the same subject
Imagine a report showing G3 Mathematics A1. Later, a family reads a post-secondary admission guide that uses a G2-based aggregate. The calculator may need a mapped number for that G3 Mathematics result. Under SEAB’s official table, A1 maps to G2 grade 1. But the original SEC result remains G3 Mathematics A1. The student did not sit a G2 Mathematics paper, and the certificate should not be rewritten as though they did.
This is a difference between qualification and calculation. The qualification documents the subject and level assessed. A progression formula may transform a grade into a number that can be combined with other qualifying subjects for one specific admission purpose. The transformed number belongs to that calculation; it does not change the subject a student studied.
Parents familiar with the older Express and Normal streams may find this unusual. Full SBB deliberately allows more mixed subject-level profiles. Grade mapping helps certain admission pathways evaluate such profiles without pretending that all levels use identical papers.
The official 2027 SEC grade structures
SEAB’s SEC information page lists the grading structures for G1, G2 and G3. G1 uses letters A through E. G2 uses the numbers 1 through 6. G3 retains the familiar O-Level-style grades A1 through 9. Although G3 A1 and G2 grade 1 both contain the numeral 1, they represent results from different curricular and assessment levels. They should never be treated as interchangeable without the applicable official mapping rule.
For families preparing younger students, the date also matters. A student beginning Secondary 1 in 2027 will ordinarily sit the four-year mainstream national examination later than 2027. The information here explains the announced SEC framework and published 2027 grade structure, but families should check the rules for their child’s eventual examination and admission year.
A school report-book percentage is another separate measure. A student can score 75% in a Secondary 2 weighted assessment, but that does not let a parent confidently assign an SEC A1 or B3. School assessment content, weighting and marking are not the same as the national examination grade awarded years later.
Official mapping from G3 grades to G2 grades
| G3 SEC grade earned | Mapped G2 grade where required |
|---|---|
| A1, A2 or B3 | 1 |
| B4, C5 or C6 | 2 |
| D7 | 3 |
| E8 | 4 |
| 9 | 5 |
Notice that the table is not a simple rule that copies the number in the G3 grade. G3 B3 does not map to G2 3; it maps to G2 1. G3 B4 maps to G2 2, not G2 4. G3 C6 also maps to G2 2. These groupings reflect the official SEAB conversion for progression purposes.
There is no G3 grade mapped to G2 grade 6 in the table. That does not mean G2 grade 6 does not exist. It means SEAB’s conversion of available G3 grades produces the mapped results shown above. The two grading systems cover different subject levels.
Do not use this table backwards to manufacture a G3 result. A student who earns G2 grade 2 has that G2 grade; they have not thereby earned G3 B4, C5 or C6. The actual examination level is part of the qualification.
Official mapping from G2 grades to G1 grades
| G2 SEC grade earned or mapped | Mapped G1 grade where required |
|---|---|
| 1, 2 or 3 | A |
| 4 | B |
| 5 | C |
| 6 | D |
This is a separate conversion. It should not be confused with G3-to-G2 mapping or with a teacher’s mark in a school report. SEAB explains that when an admission calculation requires a G3 grade at G1 level, the system first maps G3 to G2 and then G2 to G1. Families do not need to invent a new direct conversion table; the official procedure already defines the steps.
For example, G3 D7 maps to G2 3, and G2 3 maps to G1 A. This can seem counterintuitive until one remembers that the grade describes achievement under a more demanding subject syllabus. It is not a claim that the student sat the G1 paper. It is a defined calculation for a specified progression purpose.
Like the G3 table, this mapping is not reversible. A G1 A cannot be assumed equivalent to a G3 A1 simply because both involve an “A”. Parents should not rely on such shortcuts when deciding which subjects a child should take.
Worked example 1: G3 English B4 becomes what at G2?
Take a fictional student, Alicia, who earns G3 English Language B4 at SEC. For an admission calculation that requires the English result to be expressed at G2 level, the published conversion places B4 with C5 and C6. The mapped G2 grade is therefore 2. Alicia still possesses a G3 English B4 result on her national certificate.
Now suppose a friend earns G3 English B3. B3 is in the A1–B3 group and maps to G2 grade 1. Although the difference in G3 labels is one grade step, the mapped result changes from 1 to 2. It illustrates why parents should look at SEAB’s table instead of applying their own numeric arithmetic to the letter-number grade.
To use Alicia’s mapped English result in a real admission exercise, the family must still check whether the particular course accepts that subject and level, what other subjects are needed and whether minimum entry requirements apply. The mapping step alone does not decide admission.
Worked example 2: G3 Mathematics A1 and Science B3
Fictional student Ben earns G3 Mathematics A1 and G3 Science B3. If a G2-based aggregate calls for both subjects, each maps to G2 grade 1 under the official conversion table. His certificate still shows Mathematics A1 and Science B3 at G3. The mapped results are numbers used in the relevant aggregate, not an invitation to describe Ben as a G2 student.
What happens if Ben instead earns G3 Science C6? The mapped Science result is now G2 grade 2. This does not mean that C6 is identical to a G2 grade 2 in all educational respects. It means the calculation uses 2 when the specified formula calls for a mapped G2 score. The national syllabus demands remain different.
A parent who knows the table can check arithmetic more confidently, but should still resist predicting a future admission offer from one component. Subject-counting rules, minimum grades, course prerequisites, citizenship-related factors and vacancies may also affect outcomes.
Worked example 3: why the same subject cannot be counted twice
Consider fictional student Mira, who took G3 English, G3 Mathematics, G3 Science, G2 Humanities and G2 Chinese. She has one national result for each subject at the actual level examined. If a progression formula allows certain G3 subjects to be mapped to G2, the mapping changes how those qualifying results are counted. It does not create an extra English subject or an extra Mathematics subject.
Suppose Mira’s relevant grades are G3 English B4, G3 Mathematics A1, G3 Science B3, G2 Humanities 2 and G2 Chinese 5. The G2 equivalents for the G3 results are 2, 1 and 1 respectively. Her actual G2 grades remain 2 and 5. These five numbers may be inputs to an illustrative G2-based calculation where the subjects and categories are all eligible, but the family must use the specific course’s published subject selection and aggregate rules.
SEAB itself publishes an ELMAB3 example using this type of mixed-level profile. The essential concept is eligibility first, mapping second and aggregate calculation third. Adding five convenient numbers without confirming subject categories is not a valid substitute for the official exercise.
What is ELMAB3 and why might grade mapping matter?
ELMAB3 is a five-subject aggregate structure associated with particular post-secondary progression pathways and has traditionally used English Language, Mathematics and three other eligible subjects. Under the SEC framework, a student may have a mixture of G2 and G3 results. The official mapping process allows eligible more-demanding subject results to be represented at G2 level when that is required for computing the aggregate.
However, an aggregate total is only one part of admission. There can be subject eligibility rules, minimum grades and other conditions attached to programmes such as the Polytechnic Foundation Programme or particular ITE routes. Those conditions must be checked for the student’s actual admission year. A grade-mapping article cannot responsibly guarantee a place from one numerical total.
Parents should ask the school to provide the calculation using the child’s real national result slip and the official admissions guide. A family may find it useful to work through the arithmetic themselves, but the definitive eligibility decision belongs to the relevant admission authority.
What changes for polytechnic admission in 2028?
MOE announced that from the 2028 intake, Polytechnic Year 1 admission will permit a G2 subject to be used in a specified component of the ELR2B2 aggregate. The published change allows more flexible combinations while retaining requirements for the other subjects, including applicable G3 levels and minimum entry requirements. The headline change is not a blanket instruction to map every G3 grade downward or replace any required G3 subject with G2.
This is a different use of subject levels from a G2-based ELMAB3 calculation. Families should not see one mapping table and assume it governs every part of the polytechnic application. First identify the precise admissions formula. Second confirm which subjects and levels are allowed in each component. Only then use the official grade mapping where the rules direct it.
MOE also announced that the qualifying cut-off for the revised polytechnic ELR2B2 arrangement would adjust from 26 to 22 points. The numerical difference reflects a changed formula and cannot be interpreted as an identical five-subject calculation becoming four points harder. Always read the full 2028 admissions guide rather than comparing two headline numbers in isolation.
What about junior college and the revised L1R4?
From the 2028 JC intake, the announced admission calculation changes from L1R5 to L1R4. It uses five subjects rather than six, while retaining requirements for relevant subject categories. The revised gross qualifying threshold is 16 points under the announced framework. This is separate from the G2-based aggregate mapping examples and is not a reason to convert a child’s G3 English A2 into a G2 grade before using the JC formula.
Each JC or Millennia Institute applicant needs the current official subject requirements, eligible grades and any applicable bonus-point provisions. It is possible for a student to qualify for an aggregate computation yet not satisfy a particular subject prerequisite for an intended course or combination. A family should treat the full admissions rules as the source of truth.
For a younger PG3 student, it is enough to know that future routes will consider actual subject results and levels. The practical priority is to learn the chosen syllabus thoroughly and make thoughtful subject decisions in Secondary 2. A child should not be persuaded to change their present subject level based on a made-up conversion that promises future admission.
Why mapping does not make G3 and G2 equivalent courses
Curricular levels represent different learning expectations. G3 Mathematics may include more demanding applications or depth than the corresponding G2 subject. In English, texts, writing tasks and assessment standards can also differ. The national grading structures exist within these different curricula. SEAB’s grade mapping is a policy mechanism for specific progression calculations, not a declaration that every topic and skill is identical.
This distinction matters for school advice. A child who is struggling with G3 Mathematics may benefit from a suitable school review, but parents should not assume that choosing G2 guarantees a stronger future aggregate or that staying at G3 guarantees a particular route. Actual learning, grade outcomes and subject prerequisites all interact.
Ask what the student currently understands and whether the subject level remains appropriate. The decision should be about learning fit and future options together, not arithmetic alone.
Can I convert Secondary 2 report-book marks to SEC grades now?
No reliable conversion can be made simply by assigning familiar percentages to SEC grades. School assessments are designed and weighted under individual school policies, while the national SEC uses subject-specific national assessment and grading arrangements. A 70% school assessment score may reflect a particular task and level; it is not an official prediction of the student’s eventual national grade.
Parents may hear claims such as “75% always equals A1” or “a 60% report is automatically SEC B4”. Such statements ignore differences between assessment papers, curricula, national grading and years. They can create unwarranted confidence or fear. A better approach is to use the work to identify whether the student can solve unfamiliar questions independently and respond to teacher feedback.
Our PG3 report-book guide explains how to read weighted assessments and teacher comments before attempting any future national prediction.
Five common grade-mapping mistakes
Mistake 1: reading a G3 B3 as G2 3. Under the SEAB table, G3 B3 maps to G2 grade 1. The letter-number combination is not the mapped grade itself.
Mistake 2: treating G2 grade 1 as a G3 A1. Mapping is not a reverse examination result. A G2 student took the G2 curriculum and has a G2 grade.
Mistake 3: converting every subject before using any admission formula. Mapping applies only where the relevant pathway requires it. Some formulas and subject minimums use the actual G3 grade.
Mistake 4: ignoring the difference between a subject grade and aggregate eligibility. A mapped number is not a complete admissions decision. The student must meet the subject-counting and course requirements.
Mistake 5: confusing the 2027 SEC examination year with the 2028 admissions intake. The first SEC results are scheduled for January 2028. Younger secondary students have later examination and admission years.
Fictional case: Ryan compares himself with a friend
Ryan takes G3 Mathematics, and a friend takes G2 Mathematics. Ryan receives G3 C5 while his friend receives G2 grade 2. Ryan’s parent sees that G3 C5 maps to G2 grade 2 and concludes that they both completed identical assessments. That is not correct. They studied subjects at different levels and were assessed against different curriculum demands. The mapping merely permits a defined comparison for the calculation specified by policy.
A more useful question for Ryan is whether he understands his G3 Mathematics concepts independently and whether he is progressing. If he has a persistent learning gap, the family can discuss subject-level suitability with the school. If he is progressing steadily, a single numerical comparison with a friend gives little reason to change course.
The child should understand that different pathways can recognise different strengths. Grade mapping makes some progression routes more workable; it is not intended to turn classmates into a competition over who owns the better number.
Fictional case: Aisha plans a polytechnic course
Aisha is interested in a future diploma related to design or engineering. Her parents read that the revised 2028 Polytechnic Year 1 framework accepts one G2 subject in a specified component. They begin assuming that every subject level can be swapped freely and that any G2 grade will suffice. The school advises them to check the exact course minimum entry requirements and the role of English, Mathematics and relevant subjects.
Aisha makes a simple list: courses that interest her, the required subjects and levels, the course content, and any areas where she needs stronger foundations. She also explores what students actually do in the diploma rather than focusing solely on entry scores. This gives the family a decision process that can be updated as course information changes.
The advantage of accurate mapping knowledge is not that it removes uncertainty. It prevents the family from making avoidable mistakes while they consider real options.
Fictional case: Jo’s older sibling gives outdated advice
Jo begins Secondary 1 under Full SBB. Her older sibling completed examinations under the earlier O-Level system and shares a hand-written list of grade boundaries and admissions calculations. Much of the general advice about studying effectively is still useful. However, the examination framework, subject-level combinations and progression exercise are changing.
Jo’s family therefore labels each source with its intended year and purpose. One sheet describes the older GCE O-Level system; another shows SEAB’s 2027 SEC grade structures; a third records MOE’s announced 2028 admissions changes. This simple separation prevents a common error: applying a correct historical rule to the wrong cohort.
Parents do not need to discard older knowledge entirely. They need to ask which parts remain relevant and where the official updated rules differ.
A four-step manual calculation method
- Start with the actual subject result. Write the subject name, SEC level and grade exactly as recorded, such as G3 English Language B4.
- Identify the admission pathway. Is the calculation a G2-based ELMAB3, revised polytechnic ELR2B2, JC L1R4 or another route? Do not mix their components.
- Check which subjects qualify. Verify subject categories, minimum grades, permissible levels and current course-specific criteria before mapping.
- Map only when directed. Use SEAB’s exact G3-to-G2 or G2-to-G1 table, then apply the official aggregate formula. Retain the original grade alongside the mapped value for clarity.
A small table with columns for actual subject, level, actual grade, mapped value (if required) and reason for eligibility can prevent mistakes. Leave the mapped column blank if the chosen admission calculation does not call for it. Do not invent a conversion merely to make the numbers look consistent.
A four-week family preparation plan
Week 1 — Learn the vocabulary. Explain Posting Group, General subject levels, actual SEC results and mapped aggregate values. Have the student identify which label describes admission and which describes subject learning.
Week 2 — Read official examples. Compare the G3-to-G2 and G2-to-G1 tables. Practise a small number of conversions, including B3 to 1 and C6 to 2. Explain why reversing the table would be invalid.
Week 3 — Explore real routes. Select two or three programmes the student finds interesting and record the current subject prerequisites. Distinguish the programme’s learning content from its admission formula.
Week 4 — Ask the school. Check the student’s actual subjects, graduation year, subject-level readiness and Education and Career Guidance options. If the student is approaching graduation, request help with the official calculation. This is an optional family understanding exercise, not a necessary four-week course for every Secondary 1 child.
What should parents ask the school’s Education and Career Guidance team?
- Which SEC subject levels and grades will be recorded for our child’s actual graduation year?
- Which of the programmes our child is considering require G3 subjects rather than G2?
- Does the relevant admission aggregate use grade mapping, and which direction?
- Are there separate minimum entry requirements apart from the aggregate?
- How do the revised 2028 Polytechnic Year 1 rules affect the specific course?
- How should the child’s selected Humanities or Science combination be counted?
- Can we check an illustrative aggregate without treating it as a confirmed place?
- What official sources should we revisit when the child’s examination results are actually released?
- How can the student preserve useful options while keeping a manageable school workload?
- What is the next subject decision that matters now, rather than in four years?
Frequently asked questions
What does G3 A1 map to at G2?
G3 A1 maps to G2 grade 1 when a specified progression calculation requires G2 mapping.
What does G3 B3 map to?
G3 B3 also maps to G2 grade 1. It does not map to G2 grade 3.
What does G3 B4 map to?
B4 maps to G2 grade 2, together with C5 and C6.
What does G3 D7 map to?
D7 maps to G2 grade 3.
What does G3 E8 map to?
E8 maps to G2 grade 4.
What does G3 grade 9 map to?
The official table maps G3 grade 9 to G2 grade 5.
Why is G2 grade 6 missing from the G3-to-G2 table?
The official conversion does not map any G3 grade to G2 grade 6. That grade still exists in the actual G2 grading system.
How does a G2 grade 3 map to G1?
G2 grades 1, 2 and 3 map to G1 A where a G1 calculation is required.
Can a G2 grade 1 be reported as a G3 A1?
No. The student retains the actual G2 subject and grade. Official grade mapping is not a reverse award of a more demanding subject result.
Will the child’s SEC certificate show the mapped grade?
The certificate reflects actual subjects and levels taken. Mapping is used in the relevant post-secondary calculation, not to overwrite the national result.
Does a G3 subject always need mapping for JC admission?
No. Mapping is used when the applicable formula requires it. JC admission has its own subject and aggregate rules, which must be checked directly.
Can we use a school assessment percentage to predict SEC grade mapping?
Not reliably. A school-based mark is not the same as an awarded national SEC grade.
Does getting the mapped aggregate guarantee a polytechnic place?
No. Courses may impose minimum entry requirements, selection conditions and availability limits beyond the aggregate.
When will the first SEC results be released?
Under the published framework, SEC starts in 2027 and results are released in January of the following year, with the first post-results admissions exercise in 2028.
Official information and related reading
- SEAB: SEC Grading Systems, Grade-Mapping Tables and Worked ELMAB3 Example
- SEAB: 2027 G3 Subject Syllabuses
- MOE: New Post-Secondary Admissions Exercise from 2028
- MOE: Revised Polytechnic Admission Criteria from 2028
- MOE: Revised JC L1R4 Admission Criteria
- eduKatePunggol: SEC 2027 and JC, Polytechnic, ITE Admissions 2028
- eduKatePunggol: Reading G3 Report-Book Marks and Weighted Assessments
- eduKatePunggol: PG3 and Taking a G2 Subject
Keep the qualification and the calculation separate
The grade a student earns shows achievement in an actual subject and level. A mapped grade is a defined tool for certain admissions calculations. Confusing the two creates unnecessary anxiety, false assumptions about subject equivalence and sometimes incorrect course choices. The official SEAB tables make the mapping straightforward once the family knows which formula applies.
For a younger PG3 student, the priority remains learning the current syllabus and choosing subjects that fit their strengths. For a graduating student, use the actual SEC result slip, the correct admission year and the course’s official rules. That sequence—actual result, course eligibility, permitted mapping and aggregate—turns a complicated new system into a manageable decision.
Checked against SEAB’s SEC grading and mapping guidance and MOE’s published 2028 admissions announcements, 6 November 2026. Individual course criteria and later examination years must be verified with the relevant authorities.
