Cambridge IGCSE · Analysis & Prediction

2023 Cambridge IGCSE Sciences - Co-ordinated (Double) (0654) Past Paper: Analysis & Answers

This examination paper covers Core and Extended Co-ordinated Sciences across Biology, Chemistry, and Physics, featuring structured theoretical questions, multiple-choice items, and experimental planning tasks.

Updated: Jun 13, 2026

AnalysisSample paper
Difficulty 3.5/5
Total marks
220
Duration
255 mins
Most tested
—

Paper breakdown

Paper 2 Multiple Choice (Extended): 40 marks · 45 minsPaper 4 Theory (Extended): 120 marks · 120 minsPaper 6 Alternative to Practical: 60 marks · 90 mins

Examiner insights

Official report

Common pitfalls

  • Failing to convert units (such as grams to kilograms, or minutes to seconds) in multi-step physics and chemistry formulas.
  • Describing graph features in detail when the question specifically asks candidates to explain them biologically.
  • Omitting key terms in rate of reaction questions, such as writing 'more collisions' rather than 'more frequent collisions'.

Misconceptions

  • Assuming that light intensity changes the speed of current inside a light-dependent resistor (LDR) rather than the overall resistance of the component.
  • Confusing the site of vasodilation/vasoconstriction as capillaries rather than arterioles within skin structure.
  • Believing that a parallel resistor combination increases total resistance rather than reducing it.

Where marks are lost

  • Failing to balance ionic half-equations for processes like aluminium extraction or copper electrolysis.
  • Neglecting to show complete working steps in multi-step stoichiometry calculations, missing out on crucial error-carried-forward (ecf) marks.
  • Stating incorrect units or omitting units entirely for calculations like gravitational field strength and charge.

Estimated grade boundary

Updated: Jun 13, 2026

Source: Cambridge IGCSE grade thresholds (official)
GradeMarkPercentage
A*170/24071%
A141/24059%
B112/24047%
C84/24035%
D72/24030%
E60/24025%
Official grade boundaries published by Cambridge IGCSE grade thresholds (official).

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