9700 · Cambridge International A Level
9700/51
Planning, Analysis and Evaluation
Biology · June 2025 · Variant 1
Relative difficulty
Analysis source: Cambridge Assessment International Education
Analysis aligned to the official syllabus and assessment design.
3.5 / 5
270
465 min
Selection, Evolution and Speciation
Cohort performance
Session statistics from official examination reports
Total marks
270
Duration
465 min
Session difficulty
3.5 / 5
Key examiner messages
Top priorities from the principal examiner before you revise
A comprehensive examiner's analysis of the Biology 9700 May/June 2025 examination series, covering Papers 11, 21, 31, 41, and 51.
The exam suite tested theoretical precision, rigorous experimental design, graphical Michaelis-Menten and Bohr-shift construction, and taxonomic and evolutionary datasets.
Question difficulty map
How candidates performed on each question in this series
No data available in official reports
Assessment objectives
Skill and AO weighting from official examiner commentary
Skill weighting
Shows the skill mix this paper tested most heavily.
Theoretical Knowledge
Weight: 7100%Experimental
Weight: 571%Mathematical
Weight: 457%Analysis & G
Weight: 343%Scientific Reasoning
Weight: 229%
Method marks watchlist
Where working, steps, or method marks were commonly lost
No data available in official reports
Recurring mistakes across years
Themes examiners flag in multiple recent sessions for this subject
No data available in official reports
Question choice intelligence
Mean scores and popularity for optional questions (HKDSE electives)
No data available in official reports
Level exemplars
What candidate scripts at each grade level looked like
No data available in official reports
Grade & admission context
How marks relate to grade thresholds and entry standards
Report type
Cambridge Principal Examiner Report — component performance and international standards
Level A*
Approx. 77% of maximum mark
Level A
Approx. 67% of maximum mark
Level B
Approx. 58% of maximum mark
Level C
Approx. 50% of maximum mark
Level D
Approx. 42% of maximum mark
Level E
Approx. 35% of maximum mark
Deep insights
What top candidates did
Techniques and approaches examiners rewarded in this series
No data available in official reports
Command word playbook
How to match each command word to the expected response style
Give reasons and link mechanism to outcome; each point needs a because/so chain.
State features in sequence or list observable properties — do not explain causes unless asked.
Show formula, substitution, and unit; method marks need visible working.
Match the expected response style for “State” questions.
Apply knowledge to an unfamiliar context; concise, practical points score best.
Match the expected response style for “Outline” questions.
Name or point to the specific feature asked for — avoid extra explanation.
Present multiple perspectives with evidence; balance breadth and depth.
Time traps
Sections where candidates spent disproportionate time relative to marks
Min per mark: 20
Min per mark: 2.5
Min per mark: 1.3
Min per mark: 0
Syllabus traceability
Topics linked to questions and mark weighting in this session
Selection and evolution (Biology (A Level))
40 marks this session
Enzymes (Biology (AS Level))
28 marks this session
Transport in plants (Biology (AS Level))
27 marks this session
Cell membranes and transport (Biology (AS Level))
24 marks this session
Homeostasis in mammals (Homeostasis)
19 marks this session
MCQ trap analytics
Commonly chosen wrong options from examiner commentary
No data available in official reports
Topic heatmap across years
Mark concentration by topic and exam year for this subject
Mark intensity
Transport in plants (Biology (AS Level))
Cell membranes and transport (Biology (AS Level))
Homeostasis in mammals (Homeostasis)
Selection and evolution (Biology (A Level))
Enzymes
Classification, biodiversity and conservation
Cells as the basic units of living organisms (Cell structure)
Enzymes (Biology (AS Level))
Difficulty trend
How session difficulty has shifted across recent years
Paper comparison
Marks and duration breakdown across papers in this session
Paper 11 Multiple Choice:
Paper 21 AS Level Structured Questions:
Paper 31 Advanced Practical Skills 1:
Paper 41 A Level Structured Questions:
Paper 51 Planning, Analysis and Evaluation:
Marks you can still earn
Where valid approaches outside the mark scheme may still gain credit
No data available in official reports
Practise what examiners flagged
Target weak topics from this report inside the Revui app
Selection and evolution (Biology (A Level))
40 marks this session
Practise in RevuiEnzymes (Biology (AS Level))
28 marks this session
Practise in RevuiTransport in plants (Biology (AS Level))
27 marks this session
Practise in RevuiCell membranes and transport (Biology (AS Level))
24 marks this session
Practise in RevuiHomeostasis in mammals (Homeostasis)
19 marks this session
Practise in RevuiSelf-diagnostic checklist
Key actions before you sit this paper — copy and tick off as you revise
- 1Message
A comprehensive examiner's analysis of the Biology 9700 May/June 2025 examination series, covering Papers 11, 21, 31, 41, and 51.
- 2Message
The exam suite tested theoretical precision, rigorous experimental design, graphical Michaelis-Menten and Bohr-shift construction, and taxonomic and evolutionary datasets.
Teacher briefing pack
One-page session summary for tutors and classroom review
June 2025 2025
Biology
A comprehensive examiner's analysis of the Biology 9700 May/June 2025 examination series, covering Papers 11, 21, 31, 41, and 51. The exam suite tested theoretical precision, rigorous experimental design, graphical Michaelis-Menten and Bohr-shift construction, and taxonomic and e
A comprehensive examiner's analysis of the Biology 9700 May/June 2025 examination series, covering Papers 11, 21, 31, 41, and 51.
The exam suite tested theoretical precision, rigorous experimental design, graphical Michaelis-Menten and Bohr-shift construction, and taxonomic and evolutionary datasets.
- Total marks
- 270
- Duration
- 465 min
- Session difficulty
- 3.5 / 5
Session analysis
A comprehensive examiner's analysis of the Biology 9700 May/June 2025 examination series, covering Papers 11, 21, 31, 41, and 51. The exam suite tested theoretical precision, rigorous experimental design, graphical Michaelis-Menten and Bohr-shift construction, and taxonomic and evolutionary datasets.
Updated Jun 12, 2026
Paper breakdown
Paper 11 Multiple Choice:
Paper 21 AS Level Structured Questions:
Paper 31 Advanced Practical Skills 1:
Paper 41 A Level Structured Questions:
Paper 51 Planning, Analysis and Evaluation:
Top chapters
Exam structure insights
Marks by chapter
See where the marks were concentrated so revision time goes to the highest-value topics.
Mark accessibility
Estimate which marks were basic, mid-level, or high-difficulty.
74% within easy or medium reach
Command word frequency
Spot common command words so answers match the expected response style.
Question type mix
Compare the mark share of each paper section and question type.
Structured Questions
160·16·59%
Practical/Experimental
70·4·26%
Multiple Choice
40·40·15%
Study ROI
Bigger bubbles recur more often; higher bubbles carry more marks, helping you rank revision priorities.
Time vs marks
Compare marks with suggested time allocation to plan exam pacing.
Paper 11 (Multiple …
0.80 m/minPaper 21 (AS Struct…
20.05 m/minPaper 31 (Practical…1
0.05 m/minPaper 41 (A Level S…
0.40 m/minTotal marks
492
Total time
190 min
Avg pace
2.59
Next-year prediction
Topics worth watching next year, with the reason shown directly below each bar.
Antibiotics and Infectious Diseases Resistance
90%90%
Gene Control and the lac Operon
85%85%
The Nitrogen and Carbon Cycle in Conservation
80%80%
Exam tips
Paper format
- Duration
- 1h 15min
- Total marks
- 30
Analysis is paraphrased for study purposes. Always verify against the official examiner report and mark scheme.