0653 · Cambridge IGCSE
0653/41
Theory (Extended)
Science - Combined · June 2023 · Variant 1
Relative difficulty
Analysis source: Cambridge Assessment International Education
Analysis aligned to the official syllabus and assessment design.
3.2 / 5
160
180 min
Quantitative Physics and Organic Structures
Cohort performance
Session statistics from official examination reports
Total marks
160
Duration
180 min
Session difficulty
3.2 / 5
Key examiner messages
Top priorities from the principal examiner before you revise
The May/June 2023 Combined Science (0653) suite is rated at a moderate difficulty level (3.2 out of 5).
While the multiple-choice papers (Paper 11 and 21) followed familiar patterns, the written theory papers (Paper 31 and 41) and practical alternatives heavily penalized vague phrasing and mathematical shortcuts.
Strong candidates who showed step-by-step working and adhered to syllabus-specific definitions performed exceptionally well, whereas candidates relying on superficial recall struggled with multi-step calculations and chemical test descriptions.
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.
Mathematical & Calculation
Weight: 6100%Scientific Explanation
Weight: 583%Recall & Understanding
Weight: 350%Identification Interpretation
Weight: 233%
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. 72% of maximum mark
Level A
Approx. 60% of maximum mark
Level B
Approx. 48% of maximum mark
Level C
Approx. 37% of maximum mark
Level D
Approx. 32% of maximum mark
Level E
Approx. 28% of maximum mark
Deep insights
What top candidates did
Techniques and approaches examiners rewarded in this series
Overall Paper Difficulty Verdict
The May/June 2023 Combined Science (0653) suite is rated at a moderate difficulty level (3.2 out of 5). While the multiple-choice papers (Paper 11 and 21) followed familiar patterns, the written theory papers (Paper 31 and 41) and practical alternatives heavily penalized vague phrasing and mathematical shortcuts. Strong candidates who showed step-by-step working and adhered to syllabus-specific de
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.
Match the expected response style for “State” questions.
State features in sequence or list observable properties — do not explain causes unless asked.
Match the expected response style for “Deduce” questions.
Time traps
Sections where candidates spent disproportionate time relative to marks
No data available in official reports
Syllabus traceability
Topics linked to questions and mark weighting in this session
Motion, forces and energy
18 marks this session
Organic chemistry
16 marks this session
Electrochemistry
12 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
Motion, forces and energy
Organic chemistry
Electrochemistry
Electricity
Motion, forces and energy (Physics)
Transport in animals
Reproduction
Acids, bases and salts
Difficulty trend
How session difficulty has shifted across recent years
Paper comparison
Marks and duration breakdown across papers in this session
Paper 21 (Multiple Choice - Extended):
Paper 41 (Theory - Extended):
Paper 61 (Alternative to Practical):
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
Motion, forces and energy
18 marks this session
Practise in RevuiOrganic chemistry
16 marks this session
Practise in RevuiElectrochemistry
12 marks this session
Practise in RevuiSelf-diagnostic checklist
Key actions before you sit this paper — copy and tick off as you revise
- 1Message
The May/June 2023 Combined Science (0653) suite is rated at a moderate difficulty level (3.2 out of 5).
- 2Message
While the multiple-choice papers (Paper 11 and 21) followed familiar patterns, the written theory papers (Paper 31 and 41) and practical alternatives heavily penalized vague phrasing and mathematical shortcuts.
- 3Message
Strong candidates who showed step-by-step working and adhered to syllabus-specific definitions performed exceptionally well, whereas candidates relying on superficial recall struggled with multi-step calculations and chemical test descriptions.
- 4Strength
Overall Paper Difficulty Verdict: The May/June 2023 Combined Science (0653) suite is rated at a moderate difficulty level (3.2 out of
Teacher briefing pack
One-page session summary for tutors and classroom review
June 2023 2023
Science - Combined
The May/June 2023 Combined Science (0653) suite is rated at a moderate difficulty level (3.2 out of 5). While the multiple-choice papers (Paper 11 and 21) followed familiar patterns, the written theory papers (Paper 31 and 41) and practical alternatives heavily penalized vague ph
The May/June 2023 Combined Science (0653) suite is rated at a moderate difficulty level (3.2 out of 5).
While the multiple-choice papers (Paper 11 and 21) followed familiar patterns, the written theory papers (Paper 31 and 41) and practical alternatives heavily penalized vague phrasing and mathematical shortcuts.
Strong candidates who showed step-by-step working and adhered to syllabus-specific definitions performed exceptionally well, whereas candidates relying on superficial recall struggled with multi-step calculations and chemical test descriptions.
- Total marks
- 160
- Duration
- 180 min
- Session difficulty
- 3.2 / 5
Session analysis
The May/June 2023 Combined Science (0653) suite is rated at a moderate difficulty level (3.2 out of 5). While the multiple-choice papers (Paper 11 and 21) followed familiar patterns, the written theory papers (Paper 31 and 41) and practical alternatives heavily penalized vague phrasing and mathematical shortcuts. Strong candidates who showed step-by-step working and adhered to syllabus-specific definitions performed exceptionally well, whereas candidates relying on superficial recall struggled with multi-step calculations and chemical test descriptions.
Updated Jun 13, 2026
Paper breakdown
Paper 21 (Multiple Choice - Extended):
Paper 41 (Theory - Extended):
Paper 61 (Alternative to Practical):
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.
80% 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 Answer
32·16·40%
Structured Explanation
28·10·35%
Calculation
20·6·25%
Study ROI
Bigger bubbles recur more often; higher bubbles carry more marks, helping you rank revision priorities.
Next-year prediction
Topics worth watching next year, with the reason shown directly below each bar.
Space Physics (Redshift and Solar System)
85%85%
Stoichiometry & Mole Calculations
75%75%
Overall Paper Difficulty Verdict
The May/June 2023 Combined Science (0653) suite is rated at a moderate difficulty level (3.2 out of 5). While the multiple-choice papers (Paper 11 and 21) followed familiar patterns, the written theory papers (Paper 31 and 41) and practical alternatives heavily penalized vague phrasing and mathematical shortcuts. Strong candidates who showed step-by-step working and adhered to syllabus-specific definitions performed exceptionally well, whereas candidates relying on superficial recall struggled with multi-step calculations and chemical test descriptions.
Exam tips
Paper format
- Duration
- 1h 15min
- Total marks
- 80
Analysis is paraphrased for study purposes. Always verify against the official examiner report and mark scheme.