BIOLOGY-A-H020 · Cambridge OCR AS Level
BIOLOGY-A-H020/11
Breadth in Biology
Biology A · June 2023 · Variant 1
Relative difficulty
Analysis source: OCR
Analysis aligned to the official syllabus and assessment design.
3.0 / 5
140
180 min
Biological molecules, enzymes, and plant transport systems (phloem/transpiration) formed the main pillars of this exam series.
Cohort performance
Session statistics from official examination reports
Total marks
140
Duration
180 min
Session difficulty
3.0 / 5
Key examiner messages
Top priorities from the principal examiner before you revise
The June 2023 OCR AS Level Biology A papers (H020/01 and H020/02) are rated as medium difficulty (3 stars).
They successfully evaluate candidate capabilities across both wide-ranging specification knowledge and detailed, investigative depth.
H020/01 (Breadth) tested quick recall and simple calculations via its multiple-choice and brief structured questions, while H020/02 (Depth) proved more challenging by requiring candidates to synthesize experimental improvements, explain physiological relationships, and write cohesive structural-functional narratives.
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.
Knowledge
Weight: 8100%Recall
Weight: 788%Analysis & S
Weight: 675%Experimental
Weight: 563%Biological Drawing
Weight: 450%Logical
Weight: 225%Structuri
Weight: 113%
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
Examiner report — national grade boundaries and question-level commentary
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.
Match the expected response style for “State” questions.
State features in sequence or list observable properties — do not explain causes unless asked.
Show formula, substitution, and unit; method marks need visible working.
Apply knowledge to an unfamiliar context; concise, practical points score best.
Match the expected response style for “Complete” questions.
Time traps
Sections where candidates spent disproportionate time relative to marks
Min per mark: 1.3
Min per mark: 1.3
Syllabus traceability
Topics linked to questions and mark weighting in this session
Biological molecules
23 marks this session
Transport in plants
20 marks this session
Enzymes
20 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
Biological molecules
Biological membranes
Transport in animals
Communicable diseases, disease prevention and the immune system
Transport in plants
Enzymes
Cell division, cell diversity and cellular organisation
Difficulty trend
How session difficulty has shifted across recent years
Paper comparison
Marks and duration breakdown across papers in this session
H020/01 Breadth in biology: H020/02 Depth in biology:
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
Biological molecules
23 marks this session
Practise in RevuiTransport in plants
20 marks this session
Practise in RevuiEnzymes
20 marks this session
Practise in RevuiSelf-diagnostic checklist
Key actions before you sit this paper — copy and tick off as you revise
- 1Message
The June 2023 OCR AS Level Biology A papers (H020/01 and H020/02) are rated as medium difficulty (3 stars).
- 2Message
They successfully evaluate candidate capabilities across both wide-ranging specification knowledge and detailed, investigative depth.
- 3Message
H020/01 (Breadth) tested quick recall and simple calculations via its multiple-choice and brief structured questions, while H020/02 (Depth) proved more challenging by requiring candidates to synthesize experimental improvements, explain physiological relationships, and write cohesive structural-functional narratives.
Teacher briefing pack
One-page session summary for tutors and classroom review
June 2023 2023
Biology A
The June 2023 OCR AS Level Biology A papers (H020/01 and H020/02) are rated as medium difficulty (3 stars). They successfully evaluate candidate capabilities across both wide-ranging specification knowledge and detailed, investigative depth. H020/01 (Breadth) tested quick recall
The June 2023 OCR AS Level Biology A papers (H020/01 and H020/02) are rated as medium difficulty (3 stars).
They successfully evaluate candidate capabilities across both wide-ranging specification knowledge and detailed, investigative depth.
H020/01 (Breadth) tested quick recall and simple calculations via its multiple-choice and brief structured questions, while H020/02 (Depth) proved more challenging by requiring candidates to synthesize experimental improvements, explain physiological relationships, and write cohesive structural-functional narratives.
- Total marks
- 140
- Duration
- 180 min
- Session difficulty
- 3.0 / 5
Session analysis
The June 2023 OCR AS Level Biology A papers (H020/01 and H020/02) are rated as medium difficulty (3 stars). They successfully evaluate candidate capabilities across both wide-ranging specification knowledge and detailed, investigative depth. H020/01 (Breadth) tested quick recall and simple calculations via its multiple-choice and brief structured questions, while H020/02 (Depth) proved more challenging by requiring candidates to synthesize experimental improvements, explain physiological relationships, and write cohesive structural-functional narratives.
Updated Jun 14, 2026
Paper breakdown
H020/01 Breadth in biology: H020/02 Depth in biology:
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.
79% 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.
Short Structured Questions
60·24·43%
Mathematical & Practical Evaluation Questions
48·14·34%
Multiple Choice Questions
20·20·14%
Level of Response Questions
12·2·9%
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 1 - Section A…
0.77 m/minPaper 1 - Section B…
0.78 m/minTotal marks
120
Total time
155 min
Avg pace
0.77
Next-year prediction
Topics worth watching next year, with the reason shown directly below each bar.
Nucleotides and nucleic acids
5%5%
Exchange surfaces
4%4%
Executive Summary and Difficulty Verdict
The June 2023 OCR AS Level Biology A papers (H020/01 and H020/02) are rated as medium difficulty (3 stars). They successfully evaluate candidate capabilities across both wide-ranging specification knowledge and detailed, investigative depth. H020/01 (Breadth) tested quick recall and simple calculations via its multiple-choice and brief structured questions, while H020/02 (Depth) proved more challenging by requiring candidates to synthesize experimental improvements, explain physiological relationships, and write cohesive structural-functional narratives.
Examiner notes & key calculations
- Heart Dissection Drawings: Many candidates lost marks in the heart drawing task because they included shading, drew overlapping lines, or did not use a ruler for label lines.
- Immunology and Signaling: Confusing the specific roles of T-helper cells was common; many students mistakenly stated they produce perforins rather than cytokines or interleukins.
- Mathematical Rounding: Failing to check the requested precision (e.g., leaving a decimal answer when 'two significant figures' was explicitly demanded) cost preventable marks.
- Level of Response Detail: In the phloem structure and function question, candidates often explained translocation mechanics but neglected the actual labels provided in the diagram.
Exam tips
Paper format
- Duration
- 1h 30min
- Total marks
- 70
- Weighting
- 50%
- Question types
- multiple-choice, structured-short-answer, structured-medium-answer
Analysis is paraphrased for study purposes. Always verify against the official examiner report and mark scheme.