SEC grade mapping is the system used when grades from subjects taken at more demanding levels need to be converted for specific post-secondary aggregate calculations. It does not mean every G3 grade is permanently “equivalent” to one G2 grade in every context, and it does not change the level printed on the Singapore-Cambridge Secondary Education Certificate.
This distinction matters under Full Subject-Based Banding because a learner may graduate with a mixed profile — for example, English at G3, Mathematics at G2 and another subject at G1. When a post-secondary route uses an aggregate built around one reference level, SEAB may map grades from more demanding subject levels into that reference level for the purpose of computing that aggregate.
The mapping is therefore a progression tool, not a way to erase subject levels. The SEC still reflects the subjects and subject levels actually sat.
The Short Answer: How SEC Grade Mapping Works
SEAB states that grade mapping is used only when there is a need to compute aggregate scores using grades of subjects taken at more demanding levels for post-secondary progression.
- G3 to G2: G3 grades can be mapped down to G2 where a G2-based aggregate requires it.
- G2 to G1: G2 grades can be mapped down to G1 where a G1-based aggregate requires it.
- G3 to G1: where needed, the G3 grade is first mapped to G2, then the mapped G2 grade is mapped to G1.
- The original subject level remains the level the learner actually sat.
- Mapping is applied for specified progression calculations, not as a general replacement grade.
The Official G3-to-G2 Mapping
For the SEC grading system, SEAB gives the following G3-to-G2 mapping when a G2-based aggregate requires a subject taken at G3 to be converted:
- G3 A1 to B3 → G2 Grade 1
- G3 B4 to C6 → G2 Grade 2
- G3 D7 → G2 Grade 3
- G3 E8 → G2 Grade 4
- G3 Grade 9 → G2 Grade 5
There is no G3 grade shown as mapping to G2 Grade 6 in SEAB’s published table. Parents should therefore use the official table rather than inventing a linear conversion.
The Official G2-to-G1 Mapping
SEAB also publishes the following G2-to-G1 mapping for progression calculations that use G1 grades:
- G2 Grades 1 to 3 → G1 Grade A
- G2 Grade 4 → G1 Grade B
- G2 Grade 5 → G1 Grade C
- G2 Grade 6 → G1 Grade D
Again, the mapping is not a statement that the two syllabuses are identical. It is a progression conversion rule for specified aggregate calculations.
How G3 Can Be Mapped to G1
When a post-secondary calculation needs a G1 reference grade for a subject actually taken at G3, SEAB states that the grade is first mapped from G3 to G2 and then from G2 to G1.
For example, a G3 B4 maps to G2 Grade 2. G2 Grade 2 then maps to G1 Grade A. The learner’s SEC still shows the original G3 subject and G3 grade; the mapped result is used for the relevant progression calculation.
Why Mapping Exists
Full Subject-Based Banding deliberately allows mixed subject levels. Without a mapping mechanism, an admissions aggregate built around one reference level would struggle to include stronger-level subjects fairly.
Grade mapping solves that technical problem. It lets admissions systems recognise a subject taken at a more demanding level without forcing the learner into one uniform subject profile.
Mapping supports progression. It does not rewrite the learner’s SEC subject level.
A Worked Example From SEAB
SEAB gives an example of a candidate whose ELMAB3 aggregate is computed at G2. In that example, a G3 English Language grade of B4 maps to G2 Grade 2, a G3 Mathematics grade of A1 maps to G2 Grade 1, and a G3 Science grade of B3 maps to G2 Grade 1. G2 subjects remain at their original G2 grades.
The example shows the practical purpose of mapping: subjects taken at a more demanding level can contribute to a lower-level aggregate using the official mapping rules.
What Grade Mapping Is Not
- It is not a declaration that G3 B4 is academically identical to G2 Grade 2 in every respect.
- It is not a reason to ignore the original subject level.
- It is not a licence to convert grades informally for school comparisons.
- It is not a universal admissions rule for every institution and every course.
- It is not a replacement for checking current MOE, SEAB, Polytechnic, JC, MI or ITE criteria.
The Three SEC Grading Structures
At subject level, the 2027 SEC keeps different grading structures aligned to the three General subject levels.
- G1: Grades A, B, C, D and E.
- G2: Grades 1, 2, 3, 4, 5 and 6.
- G3: Grades A1, A2, B3, B4, C5, C6, D7, E8 and 9.
SEAB states that a certificate is awarded for a subject when the candidate obtains E8 or better at G3, Grade 5 or better at G2, or Grade D or better at G1.
Why Parents Should Not Compare Raw Grades Across Levels
A G2 Grade 2 and a G3 B4 may map for one progression calculation, but the learner sat different subject-level syllabuses. The original level matters because it describes the demand of the course and examination.
The better parent question is not “Which raw grade looks nicer?” It is:
What subject level did my child take, what grade did they actually earn there, and how is that result treated for the specific pathway we are considering?
How Mapping Affects Post-Secondary Planning
SEAB identifies progression aggregates such as ELMAB3 and ELR2B2 as examples where grade mapping may be used. Different post-secondary routes can use different aggregate structures and eligibility rules.
Families should therefore separate three questions:
- Eligibility: does the learner meet the subject-level and grade requirements for the pathway?
- Aggregate: how are the relevant subjects combined for ranking or admission?
- Mapping: which more-demanding-level grades are converted for that specific aggregate?
These are related but not identical questions.
A Parent Checklist for Mixed-Level SEC Results
- Write down the actual subject level for every subject.
- Record the actual SEC grade before doing any mapping.
- Identify the post-secondary route being considered.
- Find the official aggregate formula for that route.
- Use only the official mapping table when a conversion is required.
- Check minimum subject-level requirements separately from aggregate computation.
- Check the application year because admissions rules can change.
- Build more than one pathway option before results day.
Why Mapping Can Benefit a Mixed Profile
A learner should not be forced to keep every subject at the same level merely to make the final certificate look uniform. The SEC architecture is designed to recognise that strengths differ.
A student can therefore take a stronger subject at G3 and still have that achievement recognised when a G2-based progression aggregate is computed. This supports the core Full SBB principle: increase challenge where the learner can handle it without requiring uniformity across the timetable.
The eduKate Decision Rule
When parents ask whether a student should take a subject at a more demanding level because grade mapping exists, we would not begin with the mapping table. We begin with the learner.
- Is the learner conceptually secure at the current level?
- Can the learner retrieve and apply the skill independently?
- Does performance remain stable across time?
- Can the learner transfer the subject into unfamiliar questions?
- Can the learner sustain the increased workload across the whole timetable?
- Does the school evidence support the move?
Grade mapping can support progression later. It should not be used as the main reason to place a learner in a subject level that is not educationally sustainable.
Useful Reading
- What is the Singapore-Cambridge Secondary Education Certificate?
- What is Full Subject-Based Banding?
- What Happens After Secondary 4?
SEC Grade Mapping: Use the Table for the Right Job
Grade mapping is a technical bridge between subject levels for specific post-secondary progression calculations. It should be used precisely, not casually.
Start with the original SEC result. Identify the pathway. Apply the official mapping only where the official admissions rules require it. That keeps the learner’s subject-level achievement visible while making mixed profiles workable for progression.
Contact eduKate Sengkang if you want help reading a mixed G1/G2/G3 subject profile and organising the academic questions to ask before post-secondary applications.
