What the board asks

We went through the ISC board papers, question by question, and matched each question to a topic. Here is what was asked, how often, and what was never asked.

Computer Science: 180 topics in the 2027 syllabus, across 10 units. The board has asked 117 of them at least once. 63 were never asked in the papers we checked.

Pick a unit

CS8 Inheritance, Interfaces and Polymorphism

This unit carries about 5 marks in the paper. We split it into 13 topics: each is one thing an examiner can ask, and you can practise it on paper in 5 to 25 minutes. The board has asked 8 of them. 5 were never asked. The top 5 topics make 84% of all the times this unit was asked. Last asked: 2026.

8asked by the board at least once

5in the syllabus, never asked

19times a topic of this unit was asked

2.1hours for one attempt at every topic

What the papers ask most

  • Inheritance pair: subclass that computes by given rules6 times, last 2026
  • Interface versus class and versus abstract class4 times, last 2026
  • Interface rules: data members and methods3 times, last 2026
  • Inheritance pair: subclass using superclass arrays or methods2 times, last 2019
  • Abstract classes and abstract methodsonce, last 2025 improvement
  • Why interfaces: behaviour supplied by the user of a classonce, last 2024
  • Inheritance terms: superclass, subclass, extends, typesonce, last 2023
  • Class that extends a superclass and implements an interfaceonce, last 2020

In the syllabus, never asked (5)

They can still come, because they are in the syllabus. Give each one clean attempt. Your plan has two practice questions for each.

  • Member access in a subclass; private, protected, publicGive reason
  • The super keyword: constructor chaining and calling superclass methodsGive reason
  • Overriding versus overloading; redefining variables in a subclassComparison
  • Output of code with overriding and dynamic bindingDry run / output
  • The class Object as the root of every classStatement

All the topics in Computer Science: Inheritance, Interfaces and Polymorphism →

The 10 topics Computer Science papers ask most

Counted on the board papers from 2018 to the 2027 specimen paper, which every unit has been checked against.

  1. 1.Principle of duality: state it and write the dualCS1 Boolean Algebra · asked 8 times since 2018
  2. 2.Complement of an expression using De Morgan's theoremCS1 Boolean Algebra · asked 8 times since 2018
  3. 3.Word problem to truth table and SOP or POSCS1 Boolean Algebra · asked 8 times since 2018
  4. 4.K-map reduction of a four-variable POS expressionCS1 Boolean Algebra · asked 8 times since 2018
  5. 5.Pre-order, in-order and post-order traversalCS9 Data Structures · asked 8 times since 2018
  6. 6.K-map reduction of a four-variable SOP expressionCS1 Boolean Algebra · asked 7 times since 2018
  7. 7.Read a tree: leaves, internal nodes, parent, siblings, degreeCS9 Data Structures · asked 7 times since 2018
  8. 8.Truth table to classify tautology, contradiction or contingencyCS1 Boolean Algebra · asked 6 times since 2018
  9. 9.Convert between cardinal and canonical formsCS1 Boolean Algebra · asked 6 times since 2018
  10. 10.Address of an element, row major and column majorCS6 Arrays and Strings · asked 6 times since 2018

See when each unit comes in your plan