ISRO Assistant UDC Syllabus 2026 and Exam Pattern, Check Subject Wise Topics

The Indian Space Research Organisation (ISRO) is going to conduct the written exam for Assistant, UDC, and other posts. Candidates preparing for the examination should understand the latest syllabus and exam pattern to make their study plans. The ISRO Assistant UDC Syllabus 2026 includes subjects such as English, Quantitative Aptitude, General Intelligence & Reasoning, and General Knowledge. In this article, we have provided the subject-wise topics, exam pattern, and more.

ISRO Assistant UDC Syllabus and Exam Pattern 2026

Preparing for the ISRO Assistant UDC 2026 Exam, along with the ISRO Assistant UDC Syllabus and Exam Pattern 2026, helps candidates to cover the relevant topics from which questions will be asked in the exam, rather than wasting their time on irrelevant topics.

ISRO Assistant UDC Syllabus and Exam Pattern 2026- Overview
Advt. No.	ISRO: ICRB:01(A-JPA):2026
Mode of Exam	Online (Computer-Based)
Type of Questions	Objective Type
Number of Questions	200
Marks	200
Duration	150 Minute
Marking Scheme	Each Question Carries 1 Mark
Negative Marking	0.25 Mark

ISRO Assistant UDC Exam Pattern 2026

The exam pattern varries post wise. The exam will include 200 objective-type questions, and each question carries 1 mark, making a total of 200 marks. Candidates will be given a time duration of 150 minutes to complete the exam. There will be a negative marking of 0.25 marks for each incorrect answer.

Particlulars	Assistant/UDC Exam Details	JPA/Stenographers Exam Details
Mode of Exam	Online
Type of Question	Objective Type
Number of Questions	200	200
Duration	150 Minutes	150 Minutes
Total Marks	200	200
Subjects Wise Distribution	General English (50 Questions) Quantitative Aptitude (50 Questions) General Intelligence & Reasoning Ability (50 Questions) General Knowledge (50 Questions)	English Language & Comprehension (100 Questions) General Intelligence & Reasoning Ability(50 Questions) Quantitative Aptitude &General Knowledge (50 Questions)
Marking Scheme	Each Question Carries 1 Mark
Negative Marking	0.25 Mark

ISRO Assistant/UDC Syllabus 2026

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/Stenographer 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 PDF Link

The Indian Space Research Organization has released the ISRO Syllabus 2026 along with the notification. Candidates can use the direct link provided below to download the syllabus PDF.