ISRO Assistant & UDC Syllabus 2026: Candidates preparing for the ISRO Assistant and Upper Division Clerk (UDC) posts should have a clear understanding of the syllabus and selection process before starting their preparation. The written examination will include questions from General English, Quantitative Aptitude, General Intelligence & Reasoning Ability, and General Knowledge. Therefore, candidates should understand the syllabus of each subject carefully and prepare accordingly.
In this article, we have explained the ISRO Assistant & UDC Syllabus 2026 along with the complete exam pattern and subject-wise topics covered in the written examination. The article also covers the Skill Test and Selection Process, along with the syllabus PDF and practical preparation tips to help candidates understand what to study and how to prepare for each stage of the examination.
ISRO Assistant & UDC Exam Pattern 2026
| Part | Subject | No. of 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 |
Important Points
- The written examination will consist of 200 objective-type questions.
- The exam will carry a total of 200 marks.
- Each of the four subjects will have 50 questions for 50 marks.
- The total duration of the examination will be 150 minutes.
- +1 mark will be awarded for every correct answer.
- 0.25 mark will be deducted for every incorrect answer.
- The question paper will cover General English, Quantitative Aptitude, General Intelligence & Reasoning Ability, and General Knowledge.
ISRO Assistant & UDC Syllabus 2026
The complete syllabus for the ISRO Assistant and UDC written examination is provided below in detail. Candidates can check the subject-wise topics for General English, Quantitative Aptitude, General Intelligence & Reasoning Ability, and General Knowledge to understand the areas covered in the examination.
General English
Questions will test the candidate’s understanding and knowledge of the language and ability to write correctly, precisely & effectively, correct use of words, idioms & phrases, etc.
Quantitative Aptitude
Questions will be asked from the following topics:
- Number System
- Percentages
- Profit & Loss
- Discount
- Ratio & Proportion
- Mixer & Allegation
- Averages
- Simple & Compound Interest
- Time & Distance
- Time & Work
- Pipe & Cistern
- Boat & Stream
- Partnership
- Surds & Indices
- LCM & HCF
- Simplification
- Geometry (Triangles, Circles, Quadrilateral, Lines & Angles etc.)
- Mensuration (Area, Perimeter, Volume etc.)
- Trigonometry (Trigonometric Identities, Trigonometric Ratios, Circular measures of Angles, Heights & Distance etc.)
- Algebra (Factorisation, Coordinate Geometry, Polynomials, Sequence & Series, Algebraic identities, Linear equations etc.)
- Statistics & Data Interpretation
General Intelligence & Reasoning Ability
Verbal & non-verbal type questions will be asked from the following topics:
- Missing Number
- Repeated Series
- Analogy
- Venn Diagram
- Logical Arrangement of Words
- Coding & Decoding
- Sitting Arrangement
- Ranking Arrangement
- Dice
- Cube & Cuboid
- Calendar
- Number Series
- Coded Equation
- Clock
- Directions
- Counting Figures
- Problems Based on Alphabets
- Sequence
- Mirror and Water Image
General Knowledge
Questions will test the candidate’s awareness of the environment around him and its applications to the society, along with current affairs of National & International importance. The section will also include questions from the following areas:
- History
- Culture
- Geography
- Science
- Polity
- Economy
Skill Test (on Computer) for Assistant & UDC
The Skill Test will be conducted on a computer and will cover MS Word, MS Excel, and MS PowerPoint. The marks and topics for each section are given below.
| Skill Test Section | Marks | Topics Covered |
|---|---|---|
| MS Word | 35 | Opening & Saving files, Editing text documents, Inserting, Deleting, Cut, Copy, Paste, Undo, Redo, Find, Search, Replace, Formatting page & setting Margins, Converting files to different formats, Importing & Exporting documents, Tool bars, Ruler, Icons, Help, Formatting Documents, Setting font styles, Font selection (style, size, colour etc.), Bold, Italic, Underline, Case settings, Highlighting, Special symbols, Paragraph style, Alignments, Indents, Line Space, Margins, Bullets & Numbering, Setting Page Style, Page tab, Layout settings, Border & Shading, Column break, Page break, Line break, Creating Tables, Table settings, Borders, Alignments, Insertion, Deletion, Merging, Splitting, Sorting, Formula, Drawing, Clip Arts, Pictures/Files, Spell Checks, Mail Merge, Templates, Tracking changes, Security, Printing documents, Shortcut Keys |
| MS Excel | 35 | Spreadsheet & its applications, Opening Spreadsheet, Main menu, Formula Editing, Formatting, Toolbars, Help, Working with Spreadsheets, Opening & saving files, Setting margins, Spreadsheet Addressing, Rows, Columns & cells, Referring cells & selecting cells, Shortcut keys, Entering & Deleting Data, Cut, Copy, Paste, Undo, Redo, Filling continuous rows/columns, Highlighting values, Find, Search & replace, Inserting data, Insert cell, Column/row & sheet, Symbol, Clipart, Pictures, Files, Inserting functions, Manual breaks, Setting Formula, Finding total in a column/row, Using other formulae, Formatting spreadsheets, Labelling columns & rows, Formatting cell/row/column/sheet, Category, Alignment, Font, Border & shading, Hiding/unhiding rows/columns, Row height, Column width, Working with sheets, Sorting, Filtering, Validation, Consolidation and subtotal, Creating charts, Drawing, Printing, Error checking, Spell checks |
| MS PowerPoint | 30 | Opening new presentation, Different presentation templates, Setting backgrounds, Selecting presentation layouts, Creating a presentation, Setting presentation style, Adding text, Formatting a presentation, Adding style, Colour, Gradient fills, Arranging objects, Adding header & footer, Slide background, Slide layout, Adding graphics, Inserting pictures, Tables etc. |
ISRO Assistant & UDC Selection Process 2026
The selection process for ISRO Assistant and UDC posts consists of the following stages:
- Written Examination
- Skill Test
- Final Selection
ISRO Assistant & UDC Preparation Tips 2026
- Understand the syllabus: First, go through all the topics and know what you need to study.
- Make a daily timetable: Give proper time to English, Maths, Reasoning, and General Knowledge.
- Practice regularly: Solve questions every day to improve your speed and accuracy.
- Revise important topics: Keep revising formulas, vocabulary, current affairs, and important facts.
- Take mock tests: Attempt mock tests regularly to get familiar with the exam pattern and manage your time.
- Analyze your mistakes: After every mock test or practice session, identify the questions you got wrong and revise those concepts.
- Work on weak areas: Identify the topics where you make more mistakes and give them extra time.
- Practice computer skills: Prepare MS Word, MS Excel, and MS PowerPoint regularly for the Skill Test.
- Keep the last days for revision: Avoid starting completely new topics just before the examination and focus more on revision and practice.
Important Links
| Sarkari Syllabus | Click Here |
| ISRO Official Website | Click Here |
ISRO Assistant & UDC FAQs 2026
1. What is the ISRO Assistant & UDC Syllabus 2026?
The ISRO Assistant & UDC Syllabus 2026 covers General English, Quantitative Aptitude, General Intelligence & Reasoning Ability, and General Knowledge for the written examination.
2. How many questions will be asked in the ISRO Assistant & UDC written examination?
The written examination will consist of 200 objective-type questions carrying 200 marks. Each of the four subjects will have 50 questions for 50 marks.
3. What will be the duration of the ISRO Assistant & UDC written examination?
The written examination will be conducted for 150 minutes.
4. Will there be negative marking in the ISRO Assistant & UDC examination?
Yes, the examination pattern specifies 0.25 marks negative marking for each incorrect answer. Candidates should therefore attempt questions carefully.
5. What will be included in the ISRO Assistant & UDC Skill Test?
The Skill Test will assess candidates’ computer proficiency in MS Word, MS Excel, and MS PowerPoint. The test will be qualifying in nature, and candidates will have 75 minutes to complete it.