ISRO Scientist Preparation Guide

ISRO Scientist Preparation Guide 2026

Overview

ISRO Scientist practice tests across Mechanical, Electronics, Computer Science, Electrical, Civil, and aptitude, with similar PYQ series for engineering prep. It is aimed at ISRO aspirants, with a medium difficulty level.

Exam Pattern

Total: 80 questions in 90 minutes.

Detailed Syllabus

• Mechanical
• Electronics
• Computer Science
• Electrical
• Civil
• Subject Test
• Aptitude/Ability
• Similar PYQs Series
• Computer Science (CS)
• Aptitude Test

Marking Scheme

• Correct answer: +3 marks
• Wrong answer: 0 marks
• Unanswered: 0 marks

Preparation Strategy

1. Map Every Section to Time: ISRO Scientist splits 80 questions across 1 section in 90 minutes — decide a per-section time budget before test day so no single section eats your buffer.
2. Prioritize the Syllabus by Weight: Focus first on Mechanical and Electronics, then move to Computer Science, Electrical, Civil, Subject Test, Aptitude/Ability, Similar PYQs Series, Computer Science (CS), Aptitude Test — these are the subjects tested in the actual paper structure.
3. Respect the Negative Marking: A wrong answer costs 0 mark(s), so only attempt a question when you can eliminate at least two options — guessing blind against this penalty is a net loss over a full paper.
4. Simulate the Real Timer: Take full-length 90-minute mock tests on YourMockTest under exam conditions before attempting the real ISRO Scientist — pacing under pressure is a separate skill from knowing the syllabus.
5. Review Every Mistake: After each mock, spend more time reviewing wrong answers than attempting new questions — a repeated mistake in practice is a guaranteed mistake in the real exam.