Every mark explained.
The exact phrase that earned the mark is highlighted. The missing clause is named. No black box.
SEAB 9476 · Private beta
H2 Chemistry, one skill at a time.
Adaptive practice, transparent marking and spaced revision for the Singapore A-Level.
All 13 topicsDeterministic markingBuilt for 9476
Sample marked answerQuestion 03 / 05
AS-08 · Ionisation energy
Explain why the first ionisation energy of magnesium is higher than that of sodium.
M1M2A1
Magnesium has a greater nuclear charge than sodium. Aluminium's 3p electron is higher in energy and better shielded, so less energy is needed to remove it.
M2 missing — state that shielding across the period is approximately constant.
2 / 3 marksmastery 0.67
The loop is the product.
Attempt, evidence, mastery, next step. No black box.
- 01
Attempt
One question at a time, at the difficulty your current mastery calls for.
- 02
Evidence
Every earned or missed point is shown against the phrase that earned it.
- 03
Mastery
A transparent score per skill, with the calculation available on demand.
- 04
Next
The next question, review or lesson is chosen for the weakest skill first.
It knows what you have forgotten.
A per-skill review schedule brings back the concepts that are due, not the ones you just practised.
The whole syllabus, mapped.
All 13 H2 Chemistry topics share one skill map. Question banks are released in waves, starting with Atomic Structure.
How marking works
Every mark, in the margin.
A rubric point is earned by a phrase in your answer. The phrase is highlighted, the missing clause is named, and the model answer is revealed after you submit.
The beta uses deterministic matching, so the same answer always receives the same mark. If the matcher misses a valid answer, you can report it.
Try a marked answerSample marked answerQuestion 03 / 05
AS-08 · Ionisation energy
Explain why the first ionisation energy of magnesium is higher than that of sodium.
M1M2A1
Magnesium has a greater nuclear charge than sodium. Aluminium's 3p electron is higher in energy and better shielded, so less energy is needed to remove it.
M2 missing — state that shielding across the period is approximately constant.
M1Found: “greater nuclear charge”+1
M2Not found — shielding across the period is similar0
A1Found: “3p electron is higher in energy”+1
2 / 3 marksmastery 0.67
Who it is for.
JC students sitting 9476 who want to know whether an answer would earn the mark, not just whether it feels right.
The beta covers the whole 9476 syllabus. Content depth is released in waves; Atomic Structure is first because it is the foundation for Periodicity and Bonding. The full topic map is already in place, so nothing you learn disappears when the next wave lands.
Private beta terms.
Limited- Free while the beta runs.
- All 13 H2 Chemistry topics.
- MCQ and short open-ended practice.
- No AI marking and no mock papers.
- Content is self-reviewed, not teacher-reviewed.
- Your reports shape the next revision.
Questions.
Is this AI marking?
No. Open-ended answers are marked by a deterministic rubric matcher. Each point is either found in your answer or it is not, and the evidence is shown. AI is not used to award marks in this beta.
Which syllabus does it follow?
SEAB 9476 H2 Chemistry. The beta covers all 13 topics; the first content wave is Atomic Structure, followed by Chemical Bonding and the Mole Concept.
What does the private beta cost?
Nothing. The beta is free while the content and marking rules are being tested. There is no payment flow yet.
What is deliberately missing?
Content depth. All 13 topics are mapped, but question banks arrive in waves; Atomic Structure is the first. There are no mock papers, no teacher-reviewed content, no AI marking and no mobile app.
How does spaced revision work?
Mastery and review are tracked per skill. When a skill is due, it enters the review queue with a due date based on your recent accuracy and the interval since the last review.
Can I use my school notes?
Use them privately as a reference. The question bank is original content, and copyrighted notes or past papers are never uploaded to the product.