The ISRO Syllabus 2026 has been released for the Assistant, Upper Division Clerk (UDC), and Junior Personal Assistant (JPA) posts. Candidates preparing for the recruitment examination should understand the latest syllabus and exam pattern to plan their preparation effectively.
In this article, we provide the complete details on the ISRO Syllabus 2026, including detailed exam pattern, subject-wise topics, syllabus PDFs, and much more.
ISRO Assistant, UDC, and JPA Syllabus 2026
As per the ISRO Exam 2026, the written examination is objective in nature and assesses candidates on subjects such as English, Quantitative Aptitude, General Intelligence & Reasoning, and General Knowledge. However, the weightage of these sections differs for the Assistant/UDC and JPA posts.
Candidates can download the official ISRO Syllabus PDF 2026 along with the detailed exam pattern from the recruitment notification released by ISRO. The PDF contains the complete subject-wise syllabus for Assistant, UDC, and JPA posts.
ISRO Syllabus: Overview
| Particulars | Details |
| Organization |
Indian Space Research Organisation (ISRO) |
| Posts |
Assistant, Upper Division Clerk (UDC), Junior Personal Assistant (JPA) |
| Exam Mode |
Online (Computer-Based Test) |
| Question Type |
Objective (Multiple Choice Questions) |
| Negative Marking |
Yes (-0.25 mark for each wrong answer) |
| Total Duration | 120 Minutes |
| Official Website | www.isro.gov.in |
ISRO Assistant/UDC Exam Pattern 2026
The written examination for Assistant and Upper Division Clerk (UDC) consists of 200 objective-type questions carrying 200 marks. Each correct answer carries 1 mark, while 0.25 marks are deducted for every incorrect answer. The total duration of the examination is 120 minutes.
| Part | Subject | Questions | Marks |
| A | General English | 50 | 50 |
| B | Quantitative Aptitude | 50 | 50 |
| C | General Intelligence & Reasoning Ability | 50 | 50 |
| D | General Knowledge | 50 | 50 |
| Total | 200 | 200 | |
ISRO JPA Exam Pattern 2026
The Junior Personal Assistant (JPA) examination also carries 200 marks, but the distribution of questions is different. English Language & Comprehension has the highest weightage with 100 questions, making it the most important section for JPA aspirants. The examination follows the same objective format with 1 mark for each correct answer and 0.25 negative marking for incorrect responses.
| Part | Subject | Questions | Marks |
| A | English Language & Comprehension | 100 | 100 |
| B | General Intelligence & Reasoning Ability | 50 | 50 |
| C | Quantitative Aptitude & General Knowledge | 50 | 50 |
| Total | 200 | 200 | |
ISRO Assistant/UDC Syllabus
The syllabus for Assistant and UDC posts covers four major sections designed to assess language proficiency, numerical ability, reasoning skills, and general awareness.
General English
Questions are designed to evaluate candidates’ command of the English language, including:
- Grammar
- Vocabulary
- Correct usage of words
- Idioms and Phrases
- Sentence formation
- Reading and language understanding
- Writing accuracy and precision
Quantitative Aptitude
Candidates should prepare the following topics:
- Number System
- Simplification
- LCM & HCF
- Percentages
- Profit and Loss
- Discount
- Ratio and Proportion
- Average
- Simple and Compound Interest
- Time and Work
- Time, Speed and Distance
- Boats and Streams
- Pipes and Cisterns
- Partnership
- Surds and Indices
- Algebra
- Coordinate Geometry
- Polynomials
- Sequence and Series
- Geometry
- Mensuration
- Trigonometry
- Statistics
- Data Interpretation
General Intelligence & Reasoning Ability
The General Intelligence & Reasoning section tests the logical and analytical abilities of candidates. The important topics included in the syllabus are:
- Missing Number
- Number Series
- Repeated Series
- Analogy
- Coding and Decoding
- Venn Diagram
- Logical Arrangement of Words
- Sitting Arrangement
- Ranking Arrangement
- Dice
- Cube and Cuboid
- Calendar
- Clock
- Directions
- Counting Figures
- Problems Based on Alphabets
- Sequence
- Mirror Image
- Water Image
- Coded Equations
General Knowledge
This section evaluates candidates’ awareness of current events and general subjects. Candidates should prepare:
- Current Affairs (National and International)
- Indian History
- Geography
- Indian Polity
- Indian Economy
- Science and Technology
- Culture
- Environment
- Important Government Schemes
- Static General Knowledge
ISRO JPA Syllabus 2026
The Junior Personal Assistant (JPA) syllabus gives greater emphasis to English Language & Comprehension, which accounts for half of the total questions. Candidates should focus on improving grammar, vocabulary, comprehension, and writing skills along with aptitude and reasoning.
English Language & Comprehension
Candidates should prepare the following topics:
- Spot the Error
- Fill in the Blanks
- Synonyms
- Antonyms
- Detecting Misspelt Words
- Idioms and Phrases
- One Word Substitution
- Sentence Improvement
- Active and Passive Voice
- Direct and Indirect Speech
- Cloze Test
- Reading Comprehension
- Vocabulary
- Grammar
General Intelligence & Reasoning Ability
The Reasoning syllabus for JPA is similar to the Assistant/UDC examination and includes:
- Missing Number
- Number Series
- Analogy
- Coding-Decoding
- Venn Diagram
- Sitting Arrangement
- Ranking Arrangement
- Dice
- Cube and Cuboid
- Calendar
- Clock
- Directions
- Mirror Image
- Water Image
- Alphabet Problems
- Counting Figures
- Logical Arrangement
- Coded Equations
- Sequence-based Questions
Quantitative Aptitude
Important topics include:
- Number System
- Percentages
- Profit and Loss
- Discount
- Ratio and Proportion
- Average
- Simple Interest
- Compound Interest
- Time and Work
- Time, Speed and Distance
- Boats and Streams
- Pipes and Cisterns
- Partnership
- Simplification
- LCM & HCF
- Surds and Indices
- Algebra
- Coordinate Geometry
- Geometry
- Mensuration
- Trigonometry
- Statistics
- Data Interpretation
General Knowledge
Candidates should prepare the following topics:
- National Current Affairs
- International Current Affairs
- History
- Geography
- Indian Constitution
- Indian Economy
- General Science
- Culture
- Environment
- Static GK
ISRO Syllabus 2026 for Assistant/UDC PDF Download Link
ISRO Syllabus 2026 for JPA PDF Download Link
Preparation Tips for ISRO Assistant, UDC & JPA Exam 2026
Preparing according to the latest syllabus can significantly improve your chances of qualifying the examination. Here are a few useful preparation tips:
- Carefully understand the latest syllabus and exam pattern before starting your preparation.
- Prepare a daily study schedule covering all sections.
- Give extra attention to English if you are preparing for the JPA examination.
- Practice Quantitative Aptitude and Reasoning questions daily.
- Read newspapers and monthly current affairs magazines for the General Knowledge section.
- Attempt mock tests regularly to improve speed and accuracy.
- Revise formulas, grammar rules, and important current affairs frequently.
- Practice previous years’ question papers to understand the difficulty level and question trends.