BIOLOGY · Pearson Edexcel IGCSE
BIOLOGY/22
B / 2BR (Advanced Biology)
Biology · 2023 · Variant 2
Relative difficulty
Analysis source: Pearson Edexcel
Analysis aligned to the official syllabus and assessment design.
3.4 / 5
180
195 min
Data analysis, practical design (CORMS), and biochemistry calculations
Cohort performance
Session statistics from official examination reports
Total marks
180
Duration
195 min
Session difficulty
3.4 / 5
Key examiner messages
Top priorities from the principal examiner before you revise
The Summer 2023 series (Papers 1BR and 2BR) represents a moderate but highly analytical challenge, earning a 3.4 out of 5 difficulty index.
While traditional topics like the heart structure and cell organelles provided reliable base marks, candidates faced strenuous demands in data analysis.
Questions evaluating IVF success rates, global warming potentials, and cataract risks required students to move beyond simply quoting numbers, challenging them to synthesize patterns and critique experimental design.
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: 5100%Knowledge & AO2 -
Weight: 480%ApplicationAO3 -
Weight: 360%Experimental
Weight: 240%Mathematical /
Weight: 120%
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
State features in sequence or list observable properties — do not explain causes unless asked.
Give reasons and link mechanism to outcome; each point needs a because/so chain.
Show formula, substitution, and unit; method marks need visible working.
Match the expected response style for “State” questions.
Match the expected response style for “Comment” questions.
Weigh arguments for and against with evidence; end with a supported judgement.
Match the expected response style for “Determine” questions.
Time traps
Sections where candidates spent disproportionate time relative to marks
Min per mark: 1.1
Min per mark: 1.1
Syllabus traceability
Topics linked to questions and mark weighting in this session
Nutrition
23 marks this session
Transport
20 marks this session
Inheritance
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
Reproduction
Nutrition (Structure and functions in living organisms)
The organism in the environment
Reproduction (Reproduction and inheritance)
Transport
Transport (Structure and functions in living organisms)
Inheritance
Biological molecules
Difficulty trend
How session difficulty has shifted across recent years
Paper comparison
Marks and duration breakdown across papers in this session
Paper 1BR:
Paper 2BR:
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
Nutrition
23 marks this session
Practise in RevuiTransport
20 marks this session
Practise in RevuiInheritance
19 marks this session
Practise in RevuiSelf-diagnostic checklist
Key actions before you sit this paper — copy and tick off as you revise
- 1Message
The Summer 2023 series (Papers 1BR and 2BR) represents a moderate but highly analytical challenge, earning a 3.4 out of 5 difficulty index.
- 2Message
While traditional topics like the heart structure and cell organelles provided reliable base marks, candidates faced strenuous demands in data analysis.
- 3Message
Questions evaluating IVF success rates, global warming potentials, and cataract risks required students to move beyond simply quoting numbers, challenging them to synthesize patterns and critique experimental design.
Teacher briefing pack
One-page session summary for tutors and classroom review
2023 2023
Biology
The Summer 2023 series (Papers 1BR and 2BR) represents a moderate but highly analytical challenge, earning a 3.4 out of 5 difficulty index. While traditional topics like the heart structure and cell organelles provided reliable base marks, candidates faced strenuous demands in da
The Summer 2023 series (Papers 1BR and 2BR) represents a moderate but highly analytical challenge, earning a 3.4 out of 5 difficulty index.
While traditional topics like the heart structure and cell organelles provided reliable base marks, candidates faced strenuous demands in data analysis.
Questions evaluating IVF success rates, global warming potentials, and cataract risks required students to move beyond simply quoting numbers, challenging them to synthesize patterns and critique experimental design.
- Total marks
- 180
- Duration
- 195 min
- Session difficulty
- 3.4 / 5
Session analysis
The Summer 2023 series (Papers 1BR and 2BR) represents a moderate but highly analytical challenge, earning a 3.4 out of 5 difficulty index. While traditional topics like the heart structure and cell organelles provided reliable base marks, candidates faced strenuous demands in data analysis. Questions evaluating IVF success rates, global warming potentials, and cataract risks required students to move beyond simply quoting numbers, challenging them to synthesize patterns and critique experimental design.
Updated Jun 13, 2026
Paper breakdown
Paper 1BR:
Paper 2BR:
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.
81% 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 Descriptions & Explanations
85·28·47%
Data Analysis, Comment & Experimental Design
40·8·22%
Short Answer & Structural Labeling
25·15·14%
Mathematical Calculations
(Maths)
20·8·11%
Multiple Choice
10·10·6%
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 1BR (First Ha…
0.92 m/minPaper 1BR (Second H…
0.93 m/minTotal marks
125
Total time
135 min
Avg pace
0.93
Next-year prediction
Topics worth watching next year, with the reason shown directly below each bar.
Kidneys, Nephron Structure & Osmoregulation
92%92%
Plant Water Transport (Transpiration & Stomata)
85%85%
Selective Breeding of Livestock/Plants
78%78%
Difficulty Verdict
The Summer 2023 series (Papers 1BR and 2BR) represents a moderate but highly analytical challenge, earning a 3.4 out of 5 difficulty index. While traditional topics like the heart structure and cell organelles provided reliable base marks, candidates faced strenuous demands in data analysis. Questions evaluating IVF success rates, global warming potentials, and cataract risks required students to move beyond simply quoting numbers, challenging them to synthesize patterns and critique experimental design.
Where the Marks Are
A significant portion of marks resided in core practical application and mathematical reasoning. Across both papers, graph plotting, percentage calculations, magnification formulas Magnification=Image SizeActual Size \text{Magnification} = \frac{\text{Image Size}}{\text{Actual Size}} Magnification=Actual SizeImage Size, and standard deviation/repeats design (CORMS) accounted for more than 20% of the total available marks. High-scoring candidates secured full marks by showing clear step-by-step working, converting units systematically (e.g., mm to μm \mu\text{m} μm), and referencing precise biological terms like osmosis, mitosis, and turgor.
Examiner notes & key calculations
- Vague Practical Terminology: Many students confused accuracy with reliability. When asked to modify an experiment to increase accuracy (such as yeast respiration), suggesting 'more repeats' gained no marks; instead, students needed to suggest using a gas syringe to measure volume rather than counting imprecise bubbles.
- Data Evaluation Mistakes: In 'comment' and 'evaluate' items (e.g., GWP of greenhouse gases), candidates frequently just copied numbers straight from the table (e.g., 'CO2 is 77%'). Examiners require students to manipulate or add context to the data (e.g., 'carbon dioxide is released in the highest proportion, overriding its lower potency').
- Yoghurt Production Specifics: Vague accounts of *Lactobacillus* action frequently missed points by neglecting to name the substrate (lactose) and product (lactic acid) or incorrectly stating that the pH increased (making it alkaline rather than acidic).
Exam tips
Paper format
- Duration
- 1h 15min
- Total marks
- 70
- Weighting
- 38.9%
- Question types
- Comprehension Passage, Structured and Short Answer, Practical / Experimental Design, Mathematical / Calculation
Analysis is paraphrased for study purposes. Always verify against the official examiner report and mark scheme.