CCEA A-Level · Analysis & Prediction

2025 CCEA A-Level Life and Health Sciences 0008 Past Paper: Analysis & Answers

A comprehensive A2-level assessment bundle for CCEA Life and Health Sciences encompassing Units A2 2 (Organic Chemistry), A2 3 (Medical Physics), A2 4 (Sound and Light), and A2 5 (Genetics, Stem Cell Research and Cloning). Across 400 total marks, the examination balances foundational recall, practical experimental methodology, analytical calculations (including chi-squared testing, acoustic impedance, lens power, decibel intensity, and percentage yields), and structured extended response questions assessing the quality of written communication.

Updated: 31 Aug 2026

Analysis Sample paper

Difficulty 3.4/5

Total marks

400

Duration

420 mins

Most tested

Medical Diagnostic Imaging and Quantitative Applied Physics

Paper breakdown

Assessment Unit A2 2: Organic Chemistry (AZ021): 100 marks · 105 minsAssessment Unit A2 3: Medical Physics (AZ031): 100 marks · 105 minsAssessment Unit A2 4: Sound and Light (AZ041): 100 marks · 105 minsAssessment Unit A2 5: Genetics, Stem Cell Research and Cloning (AZ051): 100 marks · 105 mins

Top chapters

Diagnostic imaging techniques (A2 3: Medical Physics) · 46 marksMedical uses of radiation (A2 3: Medical Physics) · 34 marksDNA and the genetic code (A2 5: Genetics, Stem Cell Research and Cloning) · 28 marksStanding waves (A2 4: Sound and Light) · 22 marksMaking and purifying organic compounds - the preparation of aspirin (A2 2: Organic Chemistry) · 19 marks

Executive Summary & Exam Overview

The CCEA Life and Health Sciences A2 series provides an authentic synoptic challenge spanning chemical, physical, and biological disciplines applied to clinical and technological contexts. Across the four distinct units—A2 2: Organic Chemistry, A2 3: Medical Physics, A2 4: Sound and Light, and A2 5: Genetics, Stem Cell Research and Cloning—candidates face a balanced mix of calculation, theoretical explanation, and experimental evaluation.

Where the Marks Lie

Quantitative Rigour: High-tariff calculation sequences are central across every paper, including multi-step empirical and percentage yield calculations, acoustic impedance and reflection coefficients (\(R = \frac{(Z_A - Z_B)^2}{(Z_A + Z_B)^2}\)), radioactive decay kinetics (\(\ln A = \ln A_0 - \lambda t\)), sound intensity conversions (\(\text{dB} = 10\log_{10}(\frac{I}{I_0})\)), optical power calculations (\(P = \frac{1}{u} + \frac{1}{v}\)), and full statistical chi-squared (\(\chi^2\)) analysis.
Extended Practical & Mechanistic Detail: Extended response questions (6 to 8 marks) test practical protocols (such as aspirin synthesis and purification via Büchner filtration, radioactive particle comparisons, optical fibre propagation modes, and protein synthesis dynamics).
Diagrammatic Literacy: Exact drawing and labelling of mechanisms (electrophilic addition curly arrows), skeletal structures, equipment setups (optical benches, vacuum filtration), and biological pathways (tRNA structures, karyotypes, and Punnett squares).

Examiner Pitfalls & High-Yield Strategy

Mechanism Precision: In organic chemistry, ensure curly arrows start precisely from electron pairs or bonds and point directly to target atoms/charges.
Unit Conversions: Always convert distances (e.g. centimetres or nanometres to standard SI metres) prior to applying wave speed (\(v = f\lambda\)) or lens equations.
Null Hypotheses & Statistical Interpretation: Memorise the exact formal phrasing for \(\chi^2\) null hypotheses (stating no significant difference between observed and expected frequencies) and ensure degrees of freedom (\(n-1\)) and probability threshold comparisons are explicit.

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Charts

Marks by chapter

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Question type mix

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Short Answer & Recall118 marks · 52 questions
Structured Explanations & Mechanism112 marks · 34 questions
Calculations & Data Processing94 marks · 24 questions
Diagrams, Labeling & Graphs48 marks · 22 questions
Extended Response (QWC)28 marks · 4 questions

Mark accessibility

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80%within easy or medium reach

124

194

easy: 124 marksmedium: 194 markshard: 82 marks

Difficulty trend

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Command word frequency

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Skill weighting

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Study ROI

Bigger bubbles recur more often; higher bubbles carry more marks, helping you rank revision priorities.

Acoustic Impedance and Ultrasound Calculations (Medical Physics)

19 marks · Difficulty 2.8 · recurrence 5%

Aspirin Synthesis, Purification & Yield Calculations (Organic Chemistry)

19 marks · Difficulty 2.5 · recurrence 5%

Chi-Squared Testing and Genetic Linkage Analysis (Genetics)

14 marks · Difficulty 3 · recurrence 5%

Optical Power and Converging Lens Graphs (Sound and Light)

13 marks · Difficulty 2.6 · recurrence 5%

Sound Intensity and Decibel Formulae (Sound and Light)

10 marks · Difficulty 2.9 · recurrence 4%

Time vs marks

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marksmins

Next-year prediction

Topics worth watching next year, with the reason shown directly below each bar.

Recombinant DNA Plasmids & Restriction Enzymes in Insulin Production88%

Recombinant plasmid cloning vectors and ligase action regularly cycle back into the A2 5 Genetics paper.

Colorimetry and Bioassay Calibration (Analytical Techniques)85%

Beer-Lambert law applications and calibration curves were minimally tested in current chemistry and analytical components.

MRI and CT Diagnostic Imaging Physics82%

The Medical Physics unit focused heavily on X-ray tubes, PET, and ultrasound; MRI precession, relaxation times, and CT scans are due for core representation.

Cumulative marks ladder

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Topic-year heatmap

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Jun 2022

Jun 2023

Jun 2024

Jun 2025

Hydrocarbons - alkanes

Nomenclature, structure and isomerism in organic compounds

Hydrocarbons - alkenes

Polymers

Alcohols

Making and purifying organic compounds - the preparation of aspirin

Spectroscopic techniques

Physiological measurements to monitor health

Medical uses of radiation

Diagnostic imaging techniques

Examiner insights

Official report

Common pitfalls

Failing to state the unit or converting non-SI prefix values in physics formula substitutions (e.g. using cm instead of m in acoustic impedance or lens power equations).
Imprecise drawing of curly arrows in electrophilic addition mechanisms, failing to originate arrows directly from the double bond or lone pair.
Confusing the coherent imaging bundle (ordered fibres) with the non-coherent illumination bundle (random fibres) in endoscopes.
In statistical testing, providing an informal null hypothesis instead of explicitly stating that there is no significant difference between observed and expected ratios.

Misconceptions

Believing that single-mode optical fibres have wider cores than multi-mode fibres, whereas single-mode fibres feature extremely narrow cores to avoid modal dispersion.
Thinking tertiary alcohols can be oxidised using standard laboratory oxidising agents like acidified potassium dichromate.
Assuming a chi-squared value above the critical threshold supports the null hypothesis, rather than rejecting it in favor of genetic linkage.

Where marks are lost

Omitting the calculation of theoretical yield or excess reagent identification in multi-step percentage yield questions.
Losing QWC marks on extended response questions due to lack of standard scientific terminology and omitting crucial apparatus labels (e.g. Büchner funnel and side-arm flask connections).
Failing to recognise that each pregnancy carries an independent 25% probability in sex-linked genetic crosses rather than cumulative probability.

Estimated grade cut-off

Updated: 31 Aug 2026

Source: CCEA

Level	Mark	Percentage
A*	—	90%
A	—	80%
B	—	70%
C	—	60%
D	—	50%
E	—	40%

Official grade boundaries published by CCEA.

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