HUMAN-BIOLOGY · Pearson Edexcel IGCSE
HUMAN-BIOLOGY/21
R (Regional)
Human Biology · 2023 · Variant 1
Relative difficulty
Analysis source: Pearson Edexcel
Analysis aligned to the official syllabus and assessment design.
3.5 / 5
180
210 min
Internal Transport and Blood Circulation
Cohort performance
Session statistics from official examination reports
Total marks
180
Duration
210 min
Session difficulty
3.5 / 5
Key examiner messages
Top priorities from the principal examiner before you revise
High-scoring students secured solid marks in fundamental biology questions, such as identifying the structures of the reproductive system and detailing the steps of phagocytosis.
However, many candidates dropped avoidable marks due to lack of precision in calculations and failing to follow instructions.
For example, in the yoghurt nutrition calculation, a large number of students lost marks by not rounding their final answer to two significant figures or failing to convert units (such as dividing by 1000 to convert cm3cm^3cm3 to dm3dm^3dm3).
Graph-plotting remains a persistent area of weakness, with examiners reporting frequent issues such as freehand line drawing without a ruler, reversed axes, and inappropriate scales.
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: 5100%Recall
Weight: 480%Application &
Weight: 360%Experimental &
Weight: 240%Mathematical & Calculation
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
Level 9
Approx. 74% of maximum mark
Level 8
Approx. 68% of maximum mark
Level 7
Approx. 62% of maximum mark
Level 6
Approx. 55% of maximum mark
Level 5
Approx. 48% of maximum mark
Level 4
Approx. 42% of maximum mark
Level 3
Approx. 33% of maximum mark
Level 2
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.
Show formula, substitution, and unit; method marks need visible working.
State features in sequence or list observable properties — do not explain causes unless asked.
Present multiple perspectives with evidence; balance breadth and depth.
Match the expected response style for “State” questions.
Apply knowledge to an unfamiliar context; concise, practical points score best.
Time traps
Sections where candidates spent disproportionate time relative to marks
Min per mark: 1.3
Min per mark: 1.2
Min per mark: 1.1
Syllabus traceability
Topics linked to questions and mark weighting in this session
Internal transport
30 marks this session
Nutrition and energy
28 marks this session
Homeostatic mechanisms
27 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
Homeostatic mechanisms
Disease (Human Biology)
Internal transport
Nutrition and energy
Coordination (Human Biology)
Reproduction and heredity (Human Biology)
Coordination
Gas exchange (Human Biology)
Difficulty trend
How session difficulty has shifted across recent years
Paper comparison
Marks and duration breakdown across papers in this session
Paper 01 (4HB1/01):
Paper 02 (4HB1/02):
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
Internal transport
30 marks this session
Practise in RevuiNutrition and energy
28 marks this session
Practise in RevuiHomeostatic mechanisms
27 marks this session
Practise in RevuiSelf-diagnostic checklist
Key actions before you sit this paper — copy and tick off as you revise
- 1Message
High-scoring students secured solid marks in fundamental biology questions, such as identifying the structures of the reproductive system and detailing the steps of phagocytosis.
- 2Message
However, many candidates dropped avoidable marks due to lack of precision in calculations and failing to follow instructions.
- 3Message
For example, in the yoghurt nutrition calculation, a large number of students lost marks by not rounding their final answer to two significant figures or failing to convert units (such as dividing by 1000 to convert cm3cm^3cm3 to dm3dm^3dm3).
- 4Message
Graph-plotting remains a persistent area of weakness, with examiners reporting frequent issues such as freehand line drawing without a ruler, reversed axes, and inappropriate scales.
Teacher briefing pack
One-page session summary for tutors and classroom review
2023 2023
Human Biology
High-scoring students secured solid marks in fundamental biology questions, such as identifying the structures of the reproductive system and detailing the steps of phagocytosis. However, many candidates dropped avoidable marks due to lack of precision in calculations and failing
High-scoring students secured solid marks in fundamental biology questions, such as identifying the structures of the reproductive system and detailing the steps of phagocytosis.
However, many candidates dropped avoidable marks due to lack of precision in calculations and failing to follow instructions.
For example, in the yoghurt nutrition calculation, a large number of students lost marks by not rounding their final answer to two significant figures or failing to convert units (such as dividing by 1000 to convert cm3cm^3cm3 to dm3dm^3dm3).
- Total marks
- 180
- Duration
- 210 min
- Session difficulty
- 3.5 / 5
Session analysis
High-scoring students secured solid marks in fundamental biology questions, such as identifying the structures of the reproductive system and detailing the steps of phagocytosis. However, many candidates dropped avoidable marks due to lack of precision in calculations and failing to follow instructions. For example, in the yoghurt nutrition calculation, a large number of students lost marks by not rounding their final answer to two significant figures or failing to convert units (such as dividing by 1000 to convert cm3cm^3cm3 to dm3dm^3dm3). Graph-plotting remains a persistent area of weakness, with examiners reporting frequent issues such as freehand line drawing without a ruler, reversed axes, and inappropriate scales.
Updated Jun 13, 2026
Paper breakdown
Paper 01 (4HB1/01):
Paper 02 (4HB1/02):
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 Explanations & Pathophysiology
86·3·48%
Data Analysis & Calculations
36·4·20%
Experimental Design / Practical Assessment
34·3·19%
Short Answer / Structural Identification
24·4·13%
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 01 - Simple F
0.90 m/minPaper 02 - Core Rec
0.83 m/minPaper 02 - Passage
0.75 m/minTotal marks
103
Total time
130 min
Avg pace
0.79
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.
Bones, Muscles and Joints
90%90%
Disease and Defences (Active/Passive Immunity, Vaccine Action)
85%85%
Genetic Crosses (Pedigree Charts and Phenotypic Ratios)
80%80%
Examiner notes & key calculations
- Vague Terminology: Candidates frequently relied on vague generalizations. In the tooth decay question, writing 'mouthwash kills bacteria' was not credited; candidates were expected to attribute specific actions to specific components (e.g., alcohol kills bacteria, whereas sodium fluoride strengthens enamel).
- Genetic Inheritance Assumptions: For the sickle-cell anaemia inheritance question, a major pitfall was treating the condition as sex-linked (using XhX^hXh and YYY), which negated all diagram and explanation marks. Sickle-cell is autosomal recessive.
- Anatomical Spelling and Confusion: Confusing the 'ureter' with the 'urethra' was widespread, with many candidates writing hybrid spellings that could not be rewarded.
- Infeasible Practical Designs: When asked to design an experiment comparing antibacterial solutions, weaker candidates suggested impractical methods such as using microscopes to count individual dead bacteria directly, rather than using standard aseptic plate-streaking techniques and measuring zones of inhibition.
Exam tips
Paper format
- Duration
- 1h 45min
- Total marks
- 90
- Weighting
- 50%
- Question types
- Multiple Choice, Sentence Completion / Gap Fill, Calculation, Diagram Drawing / Labeling, Short Answer / Identification, Extended Answer / Explanation
Analysis is paraphrased for study purposes. Always verify against the official examiner report and mark scheme.