Cambridge IAL · Analysis & Prediction

2026 Cambridge IAL Computer Science (9618) Past Paper: Analysis & Answers

The Cambridge International AS & A Level Computer Science (9618/12/22/32/42) May/June 2026 examination series presents a balanced assessment across all four components. Paper 1 assesses theoretical foundations spanning bitmap representation, database schema design, and system architecture. Paper 2 tests algorithmic implementation in pseudocode, state-transition diagrams, and ADT stack tracking. Paper 3 tests advanced topics including Karnaugh maps, De Morgan's laws, Dijkstra's algorithm, and file random access. Paper 4 delivers practical implementation of insertion sort, OOP classes, and 2D-array pointer-based linked list manipulation.

Updated: 23 Sept 2026

Analysis Sample paper

Difficulty 3.4/5

Total marks

300

Duration

450 mins

Most tested

Further Programming and Practical Data Structure Manipulation

Paper breakdown

Paper 1 Theory Fundamentals (9618/12): 75 marks · 90 minsPaper 2 Fundamental Problem-solving and Programming Skills (9618/22): 75 marks · 120 minsPaper 3 Advanced Theory (9618/32): 75 marks · 90 minsPaper 4 Practical (9618/42): 75 marks · 150 mins

Top chapters

Further Programming · 83 marksProgramming · 39 marksComputational thinking and Problem-solving · 27 marks

Overall Examination Verdict

The May/June 2026 series for syllabus 9618 offers a comprehensive evaluation spanning foundational theory, algorithmic design, advanced computing paradigms, and hands-on coding. Across Papers 1, 2, 3, and 4, the demand is well balanced between standard textbook recall, algorithmic precision, and practical problem-solving.

Where the Marks Are Won and Lost

Paper 1 (Theory Fundamentals): Marks are heavily concentrated in relational database normalization and SQL queries (11 marks), image and sound representation (8 marks), and OS resource management (11 marks). Common mark losses occur when candidates confuse validation with verification techniques or neglect to specify table references when joining in SQL.
Paper 2 (Problem-solving & Pseudocode): High mark allocations are found in modular algorithm design (18 marks for string encryption and grid mapping) and stack operations (9 marks). Loss of marks often arises from boundary miscalculations in 1-based vs 0-based indexing and incorrect parameter passing modes (\(\text{BYVAL}\) vs \(\text{BYREF}\)).
Paper 3 (Advanced Theory): Essential marks reside in Dijkstra’s algorithm tracing (8 marks), Karnaugh map minimization and Boolean reduction (8 marks), and OOP class modeling (9 marks). Precision in notation (showing interim node weights and table states) is critical to capturing working marks.
Paper 4 (Practical Coding): Core marks stem from linked list maintenance using parallel/2D arrays (25 marks), OOP class implementation with validation loops (25 marks), and array searching/sorting routines (25 marks). Candidates forfeit easy marks by failing to include user-facing prompt strings or mismanaging exception blocks during file input/output.

Key Pitfalls and Strategy

Ensure rigorous differentiation between similar syllabus concepts (e.g., image vs screen resolution, serial vs sequential file organisation, symmetric vs asymmetric cryptography). In coding and pseudocode questions, pay meticulous attention to maintaining pointers when deleting or adding nodes in abstract data types, and ensure all specified parameter types and return contracts match the rubric precisely.

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Charts

Marks by chapter

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Question type mix

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Practical Programming Code & Evidence75 marks · 12 questions
Pseudocode Writing & Algorithm Completion52 marks · 8 questions
Short Answer & Terminology Definitions44 marks · 18 questions
Structured Explanations & Descriptions48 marks · 15 questions
Calculations, Conversions & Traces36 marks · 9 questions
Database SQL & Schema Operations16 marks · 3 questions
Logic Circuits, K-Maps & Boolean Algebra17 marks · 5 questions
State Diagrams & ADT Stack Tracing12 marks · 4 questions

Mark accessibility

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77%within easy or medium reach

134

easy: 96 marksmedium: 134 markshard: 70 marks

Difficulty trend

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Command word frequency

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Skill weighting

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Study ROI

Higher bubbles carry more marks; bubbles further left are easier. Start with the topics that sit high and to the left.

Object-Oriented Programming & Practical Implementation

55 marks · Difficulty 2.8

Abstract Data Types (Linked Lists & Stacks)

42 marks · Difficulty 3.4

Sorting & Searching Algorithms (Bubble, Insertion, Dijkstra)

34 marks · Difficulty 3.2

Binary Representation & Floating-Point / Logic Gates

24 marks · Difficulty 2.9

Relational Databases & SQL Queries

18 marks · Difficulty 2.7

Time vs marks

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marksmins

Next-year prediction

Topics worth watching next year, and why. These are informed guesses from past papers, not a forecast.

Binary Search Trees & Recursive Traversals

After heavy focus on linked lists and 2D arrays in Paper 4 and Paper 3, binary search tree insertion/deletion or recursive traversals are anticipated next.

Assembly Language & Low-Level Instruction Tracing

Assembly programming and trace tables had limited presence in Paper 1/Paper 2 in recent variants, making a deep trace question highly likely in upcoming series.

Operating System Scheduling Algorithms & Deadlock

Process scheduling and paging/segmentation appear cyclically in Paper 3 Advanced Theory and remain high priority.

Cumulative marks ladder

The line is your running mark total question by question; dashed lines are the estimated grade boundaries, taken from the table below when this year's are known. 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.

Topic-year heatmap

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Jun 2023 (V1)

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Further Programming

106

Programming

Algorithm Design and Problem-solving

Computational thinking and Problem-solving

Data Representation

Databases

Information representation

Data Types and Structures

Processor Fundamentals

Communication

Examiner insights

Official report

Common pitfalls

Confusing verification (visual checking, double entry) with validation checks (presence, range, format) in Paper 1.
Failing to pass swap parameters BYREF in procedural implementations, resulting in local copies being swapped rather than array elements in Paper 2.
Omitting the infinity symbol on unvisited nodes during the initialisation stage of Dijkstra's algorithm in Paper 3.
Hardcoding array sizes or missing exception handling syntax when reading text files in Paper 4.

Misconceptions

Believing screen resolution limits the resolution of an image file rather than simply its rendering quality.
Assuming symmetric key encryption provides authentication and non-repudiation without asymmetric key pairs.
Treating serial and sequential file organisations as identical, neglecting that sequential requires strict key-based ordering.

Where marks are lost

Missing the GROUP BY clause or forgetting table aliases when joining relations in SQL aggregate queries.
Incorrect bounds in 2D array declarations (e.g. using parentheses instead of square brackets or specifying incorrect dimension sizes).
Failure to properly update empty list head pointers after linked list insertion in practical coding.

Estimated grade boundary

Updated: 23 Sept 2026

Source: Cambridge International grade thresholds (official)

Grade	Mark	Percentage
A*	240/300	80%
A	206/300	69%
B	172/300	57%
C	142/300	47%
D	112/300	37%
E	83/300	28%

Official grade boundaries published by Cambridge International grade thresholds (official).

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