TWENTY-FIRST-CENTURY-SCIENCE-BIOLOGY-B-J257 · Cambridge OCR GCSE (9–1)
TWENTY-FIRST-CENTURY-SCIENCE-BIOLOGY-B-J257/41
Depth in Biology (Higher Tier)
Twenty First Century Science Biology B · June 2023 · Variant 1
Relative difficulty
Analysis source: OCR
Analysis aligned to the official syllabus and assessment design.
3.4 / 5
180
210 min
Natural selection, sex-linked genetic inheritance, and ecosystem energy transfers.
Cohort performance
Session statistics from official examination reports
Total marks
180
Duration
210 min
Session difficulty
3.4 / 5
Key examiner messages
Top priorities from the principal examiner before you revise
The June 2023 J257 assessment suite presented a balanced yet demanding set of papers across both Foundation and Higher tiers.
With a strong emphasis on data interpretation, calculations, and structured explanations of evolutionary mechanisms, the paper's difficulty is evaluated at a robust 3.4 out of 5.
While direct recall questions (AO1) gave students solid ground early in the breadth papers, the depth papers challenged candidates to apply concepts to unfamiliar, real-world scenarios—such as the genetic study of tuskless elephants in Mozambique and the enzymology of soil fungi.
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.
AO1 - Knowledge w
Weight: 4100%DemonstratiAO2 -
Weight: 375%ApplicationAO3 -
Weight: 250%Analysis, E
Weight: 125%
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
Level 9
Approx. 71% of maximum mark
Level 8
Approx. 64% of maximum mark
Level 7
Approx. 57% of maximum mark
Level 6
Approx. 48% of maximum mark
Level 5
Approx. 39% of maximum mark
Level 4
Approx. 31% of maximum mark
Level 3
Approx. 26% 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.
Apply knowledge to an unfamiliar context; concise, practical points score best.
Name or point to the specific feature asked for — avoid extra explanation.
Time traps
Sections where candidates spent disproportionate time relative to marks
Min per mark: 1.2
Min per mark: 1.2
Syllabus traceability
Topics linked to questions and mark weighting in this session
How do sexual and asexual reproduction affect evolution? (Life on Earth – past, present and future)
25 marks this session
How do substances get into, out of and around our bodies? (The human body – staying alive)
22 marks this session
How are organisms in an ecosystem interdependent? (Living together – food and ecosystems)
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
How do substances get into, out of and around our bodies? (The human body – staying alive)
How do sexual and asexual reproduction affect evolution? (Life on Earth – past, present and future)
How does the nervous system help us respond to changes? (The human body – staying alive)
How do producers get the substances they need? (Living together – food and ecosystems)
How are organisms in an ecosystem interdependent? (Living together – food and ecosystems)
How can and should gene technology be used? (You and your genes)
What happens during photosynthesis? (Living together – food and ecosystems)
How are populations affected by conditions in an ecosystem? (Living together – food and ecosystems)
Paper comparison
Marks and duration breakdown across papers in this session
J257/03 Breadth in Biology (Higher Tier): J257/04 Depth in Biology (Higher Tier):
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
How do sexual and asexual reproduction affect evolution? (Life on Earth – past, present and future)
25 marks this session
Practise in RevuiHow do substances get into, out of and around our bodies? (The human body – staying alive)
22 marks this session
Practise in RevuiHow are organisms in an ecosystem interdependent? (Living together – food and ecosystems)
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 J257 assessment suite presented a balanced yet demanding set of papers across both Foundation and Higher tiers.
- 2Message
With a strong emphasis on data interpretation, calculations, and structured explanations of evolutionary mechanisms, the paper's difficulty is evaluated at a robust 3.4 out of 5.
- 3Message
While direct recall questions (AO1) gave students solid ground early in the breadth papers, the depth papers challenged candidates to apply concepts to unfamiliar, real-world scenarios—such as the genetic study of tuskless elephants in Mozambique and the enzymology of soil fungi.
Teacher briefing pack
One-page session summary for tutors and classroom review
June 2023 2023
Twenty First Century Science Biology B
The June 2023 J257 assessment suite presented a balanced yet demanding set of papers across both Foundation and Higher tiers. With a strong emphasis on data interpretation, calculations, and structured explanations of evolutionary mechanisms, the paper's difficulty is evaluated a
The June 2023 J257 assessment suite presented a balanced yet demanding set of papers across both Foundation and Higher tiers.
With a strong emphasis on data interpretation, calculations, and structured explanations of evolutionary mechanisms, the paper's difficulty is evaluated at a robust 3.4 out of 5.
While direct recall questions (AO1) gave students solid ground early in the breadth papers, the depth papers challenged candidates to apply concepts to unfamiliar, real-world scenarios—such as the genetic study of tuskless elephants in Mozambique and the enzymology of soil fungi.
- Total marks
- 180
- Duration
- 210 min
- Session difficulty
- 3.4 / 5
Session analysis
The June 2023 J257 assessment suite presented a balanced yet demanding set of papers across both Foundation and Higher tiers. With a strong emphasis on data interpretation, calculations, and structured explanations of evolutionary mechanisms, the paper's difficulty is evaluated at a robust 3.4 out of 5. While direct recall questions (AO1) gave students solid ground early in the breadth papers, the depth papers challenged candidates to apply concepts to unfamiliar, real-world scenarios—such as the genetic study of tuskless elephants in Mozambique and the enzymology of soil fungi.
Updated Jun 14, 2026
Paper breakdown
J257/03 Breadth in Biology (Higher Tier): J257/04 Depth in Biology (Higher Tier):
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.
78% 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 Explain / Process
68·22·38%
Short Answer / Matching / Recall
62·35·34%
Multiple Choice / Tick-box
38·28·21%
Extended Writing
(Level of Response)
12·2·7%
Study ROI
Bigger bubbles recur more often; higher bubbles carry more marks, helping you rank revision priorities.
Difficulty trend
Compare difficulty across recent years.
Time vs marks
Compare marks with suggested time allocation to plan exam pacing.
Paper 3 (Breadth in
0.86 m/minPaper 4 (Depth in B
0.86 m/minTotal marks
180
Total time
210 min
Avg pace
0.86
Cumulative marks ladder
The line is your running mark total question by question; dashed lines are the estimated grade cut-offs. See which question the line crosses your target grade at, so you know how far you must answer cleanly and which questions decide a band.
Next-year prediction
Topics worth watching next year, with the reason shown directly below each bar.
Photosynthesis Limiting Factors Graphs
90%90%
Plant Hormones & Auxins
85%85%
Stem Cell Technology & Therapeutics
75%75%
OCR GCSE Biology B J257 2023 Analysis
The June 2023 J257 assessment suite presented a balanced yet demanding set of papers across both Foundation and Higher tiers. With a strong emphasis on data interpretation, calculations, and structured explanations of evolutionary mechanisms, the paper's difficulty is evaluated at a robust 3.4 out of 5. While direct recall questions (AO1) gave students solid ground early in the breadth papers, the depth papers challenged candidates to apply concepts to unfamiliar, real-world scenarios—such as the genetic study of tuskless elephants in Mozambique and the enzymology of soil fungi.
Exam tips
Paper format
- Duration
- 1h 45min
- Total marks
- 90
- Weighting
- 50%
- Question types
- Multiple Choice / Match, Short Answer Labeling / Recall, Structured Explanations, Mathematical Analysis, Level of Response Extended Writing
Analysis is paraphrased for study purposes. Always verify against the official examiner report and mark scheme.