A clearer next step for IB students.

BACC connects practice, explanations and spaced review so students can understand their mistakes and decide what to study next.

Meet our pilot subject contributors

Julia Mercer

Mathematics AA

Experienced mathematics problem-solving mentor

Julia works with IB maths students on method marks, calculator strategy, algebraic accuracy, and sustained practice plans for SL and HL.

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William Parker

Biology

Experienced biology systems and data mentor

William focuses on mechanism-based explanations, graph interpretation, practical skills, and disciplined recall for IB biology.

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Isabel Reed

Chemistry

Experienced chemistry revision strategist

Isabel supports IB chemistry students with topic sequencing, calculation fluency, data booklet use, and high-precision written explanations.

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Jonathan Carter

Physics

Veteran physics concept and calculation coach

Jonathan helps IB physics students move between models, equations, units, diagrams, and data interpretation with more confidence.

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How the improvement pilot works

Diagnostics are short knowledge checks. Numeric and selected-response answers receive rule-based feedback; written responses are self-assessed against an illustrative rubric. Follow-up sets use different questions on matched skills. These exercises are original BACC materials, not official exam papers. New pilot material needs subject review before it can be described as independently validated.

Reports distinguish self-assessment from automatic checks and avoid predicting an IB grade from a small sample.

Try the diagnostic