Which Science & Technology topics matter most for UPSC IFoS?

How to crack Science & Tech for Prelims (mechanism-over-memorisation method) carry the highest question counts based on previous-year analyses.

Is this Science & Technology material free?

Yes — every chapter, practice set and flashcard deck here is free. Premium mock tests and live courses from tutors are labelled separately.

UPSC IFoSScience & Technology

Science & Technology for UPSC IFoS

8–12 questions, almost entirely current-affairs-driven on a compact static base — shared with CSE.

📊 8–12 Q · 16–24 marks (~10% of GS Paper I)

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How toppers play this section

The smallest static block but among the highest current-affairs density. The static base — how satellites/orbits work, vaccine/genome-editing mechanisms, missile and defence-system categories — is what turns a headline into an answerable question.

Chapters

Built to the UPSC IFoS blueprint — notes, shortcuts, solved PYQ-style examples and practice in every chapter.

1How to Crack Science & Tech for PrelimsWhy Science & Tech is the smallest static block but among the highest current-affairs density, the mechanism-over-memorisation approach, and the two-chapter structure this hub follows.⏱ 18 min read

2Space Technology & DefenceSatellite orbit types, ISRO's major launch vehicles and programmes, India's satellite navigation system, and the missile/defence classification system UPSC tests through nearly every launch or test headline.⏱ 44 min read

3Biotechnology, IT & HealthGenetic engineering and CRISPR basics, vaccine types and mechanisms, major health programmes and diseases, and India's digital/IT initiatives — the compact biology and information-technology mechanisms behind health and tech current affairs.⏱ 44 min read

Topic-wise weightage in UPSC IFoS

Expected question counts from previous-year paper analyses. Topics with an arrow already have a full chapter.

Topic	Prelims Q	Priority
How to crack Science & Tech for Prelims (mechanism-over-memorisation method)	—	Very high
Space technology & defence	4–5	High
Biotechnology, IT & health	4–5	High