Cambridge IGCSE · Analysis & Prediction

2025 Cambridge IGCSE Sciences - Co-ordinated (Double) (0654) Past Paper: Analysis & Answers

An overview of the May/June 2025 series of the Cambridge IGCSE Co-ordinated Sciences (Double) (0654) examinations, highlighting key testing areas in biology, chemistry, and physics, along with examiner insights on core conceptual hurdles.

Updated: Jun 13, 2026

AnalysisSample paper
Difficulty 3.4/5
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

  • Misunderstanding the direction of water potential gradient in root hair cells, often writing that salt moves rather than water by osmosis.
  • Struggling to balance ionic half-equations at the cathode, particularly omitting state symbols or incorrect charge signs on electrons.
  • Confusing step-up and step-down transformer coil ratio calculations, leading to inverted voltage values.

Misconceptions

  • Believing that the temperature of an endothermic reaction mixture increases due to 'taking in' heat from the surroundings.
  • Confusing addition polymerisation (producing only polymer) with condensation polymerisation (producing polymer and a small molecule like water).
  • Assuming that a real image can be formed by a plane mirror.

Where marks are lost

  • Failing to convert mass from grams to kilograms when calculating gravitational potential energy using \( E_p = mgh \).
  • Vague explanations of convection in stars, missing the link between density changes and rising/sinking gas.
  • Incomplete definitions of an isotope, omitting that they must have the same number of protons (or be atoms of the same element).

Estimated grade boundary

Updated: Jun 13, 2026

Source: Cambridge IGCSE grade thresholds (official)
GradeMarkPercentage
A*170/24071%
A144/24060%
B118/24049%
C93/24039%
D80/24033%
E67/24028%
Official grade boundaries published by Cambridge IGCSE grade thresholds (official).

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