ISSB Most Important Topics 2026
Which ISSB chapters are worth the most marks, ranked from the Inter Services Selection Board subject weightage for Inter Services Selection Board and, where the same chapters appear on papers TestUstad has counted, from the distribution measured across those papers. Every subject page below states exactly which of the two it used.
Start at the top and work down. Every chapter here links to free ISSB MCQs with a written explanation on every answer, no fee and no account needed.
ISSB most important topics by subject
The full ranked chapter list for each subject on the ISSB paper, with how the numbers for that subject were arrived at stated on the page.
ISSB Verbal Intelligence most important topics
10 chapters, 25 MCQs on the paper
Mapped from 11 solved past papers (2005 to 2025)
Top 3: Letter, Symbol and Number Series, Critical Thinking and Logical Problems
See all ranked topicsISSB Non-Verbal Intelligence most important topics
7 chapters, 15 MCQs on the paper
Estimated from the official ISSB syllabus weighting
Top 3: Figure Rotation, Mirror Images and Water Images
See all ranked topicsISSB Mathematics most important topics
3 chapters, 25 MCQs on the paper
Estimated from the official ISSB syllabus weighting
Top 3: Arithmetic, Algebra and Geometry
See all ranked topicsISSB English most important topics
4 chapters, 20 MCQs on the paper
Mapped from 48 solved past papers (2005 to 2025)
Top 3: Grammar, Vocabulary and Comprehension
See all ranked topicsISSB General Knowledge most important topics
7 chapters, 15 MCQs on the paper
Estimated from the official ISSB syllabus weighting
Top 3: World Geography, World History and International Organizations
See all ranked topicsISSB chapter weightage at a glance
ISSB Verbal Intelligence: 25 MCQs
All 10 chaptersMapped from 11 solved past papers (2005 to 2025)
| Chapter | Expected MCQs | Priority |
|---|---|---|
| Letter, Symbol and Number Series | 6.1 | Critical |
| Critical Thinking | 5.3 | Critical |
| Logical Problems | 3.4 | Important |
| Cause and Effect | 2.7 | Important |
| Quantitative Reasoning | 1.9 | Important |
ISSB Non-Verbal Intelligence: 15 MCQs
All 7 chaptersEstimated from the official ISSB syllabus weighting
| Chapter | Est. MCQs | Priority |
|---|---|---|
| Figure Rotation | 2.6 | Critical |
| Mirror Images | 2.6 | Critical |
| Water Images | 2.6 | Critical |
| Figure Analogies | 1.8 | Important |
| Figure Series | 1.8 | Important |
ISSB Mathematics: 25 MCQs
All 3 chaptersEstimated from the official ISSB syllabus weighting
| Chapter | Est. MCQs | Priority |
|---|---|---|
| Arithmetic | 17.1 | Critical |
| Algebra | 4.3 | Important |
| Geometry | 3.6 | Standard |
ISSB English: 20 MCQs
All 4 chaptersMapped from 48 solved past papers (2005 to 2025)
| Chapter | Expected MCQs | Priority |
|---|---|---|
| Grammar | 8.2 | Critical |
| Vocabulary | 6.3 | Important |
| Comprehension | 4.9 | Important |
| Writing Skills | 0.6 | Standard |
ISSB General Knowledge: 15 MCQs
All 7 chaptersEstimated from the official ISSB syllabus weighting
| Chapter | Est. MCQs | Priority |
|---|---|---|
| World Geography | 9.2 | Critical |
| World History | 2.4 | Important |
| International Organizations | 1.2 | Standard |
| Sports | 0.8 | Standard |
| Inventions and Discoveries | 0.6 | Standard |
ISSB most important topics: frequently asked questions
What are the most important topics for ISSB 2026?
The highest-value ISSB chapters are Grammar (English, about 8.2 MCQs), Vocabulary (English, about 6.3 MCQs), Letter, Symbol and Number Series (Verbal Intelligence, about 6.1 MCQs), Critical Thinking (Verbal Intelligence, about 5.3 MCQs) and Comprehension (English, about 4.9 MCQs). That ranking comes from the Inter Services Selection Board subject weightage for ISSB combined with the chapter distribution measured across the 48 solved papers TestUstad holds for the same chapters. Every one of these chapters has free MCQs on TestUstad.
Is it enough to study only the most important ISSB topics?
No, and no honest ranking says otherwise. The top chapters on this page are where your first hours should go because they carry the most marks per hour, but ISSB is a competitive exam decided by a few marks, and the chapters at the bottom of this table still appear on the paper every year. Use this order to decide what to do first and what to revise last, not what to skip.
Where do these ISSB topic rankings come from?
TestUstad does not hold solved ISSB past papers yet, and this page does not pretend otherwise. The ranking is built from the Inter Services Selection Board subject weightage for Inter Services Selection Board, combined, for subjects whose chapters are also examined by papers TestUstad has counted, with the chapter distribution measured across those papers. Each subject page states exactly which of the two applies to it.
How many MCQs is each ISSB chapter worth?
Chapter by chapter, that is exactly what the tables on this page show. The single heaviest chapter on the ISSB paper is Grammar at about 8.2 MCQs, and the subject pages break down every remaining chapter the same way.
Can I practise the most important ISSB topics free?
Yes. Every chapter listed on this page links to free MCQs on TestUstad, with unlimited attempts, no daily limit, no card and no account needed to start. Each question carries a written explanation of why the correct option is correct, so a chapter you are weak in teaches you as you work through it.