How many months of current affairs are relevant for UPSC — what is the CA window?

The relevant current affairs window for UPSC Prelims and Mains is approximately 12–18 months prior to the exam date. Analysis of PYQs shows the majority of CA-linked questions come from the last 12–15 months, with a meaningful secondary share from 15–24 months prior. Events beyond 24 months are usually treated as static knowledge rather than current affairs.

The CA Window: What PYQ Analysis Shows

Based on analysis of UPSC Prelims PYQs from 2013–2024 (multiple coaching institute breakdowns, including DrishtiIAS Prelims Analysis and PrepAiro PYQ analysis):

Current affairs questions in UPSC Prelims 2024: 15–18 direct CA questions (approximately 15–18% of 100 GS1 questions), plus a larger share of questions that require CA context to answer correctly even if rooted in static knowledge.

Time distribution of CA-linked questions (approximate):

Time Period Before Exam	Share of CA-linked Questions	Why
Last 6 months	25–30%	Most recent events; high salience
6–12 months prior	35–40%	Peak CA window — events that had time to develop but are still fresh
12–18 months prior	15–20%	Ongoing developments; events with continuing significance
18–24 months prior	8–12%	Usually only events with long-term policy implications
Beyond 24 months	3–5%	Treated as static knowledge; usually landmark events

Combined 12-month window: approximately 60–70% of CA-linked questions. Combined 18-month window: approximately 75–85%.

Note: UPSC does not publish this breakdown officially. The figures above represent consensus estimates from multiple PYQ analyses — treat them as directional guidance rather than precise numbers.

Practical Implications by Exam

For Prelims (June 2026)

Core window: June 2025 – June 2026 (12 months) — this must be covered comprehensively
Extended window: December 2024 – June 2026 (18 months) — important for events with continued policy relevance
Catch-up window: November 2024 – June 2026 — if you started CA in November 2024, you are within the viable preparation range
Action: If you are reading this in mid-2026 and have not covered CA since December 2024, you have a gap in the extended window — use monthly magazine archives to fill it

For Mains (October–November 2026)

Core window: November 2025 – November 2026
Extended window: May 2025 – November 2026
Critical difference for Mains: Coverage depth matters more than breadth. A Mains candidate needs to understand 5–10 major events at analytical depth (causes, stakeholders, government response, implications, way forward), not superficial awareness of 50 events.

The UPSC Prelims 2025 CA Pattern

Prelims 2025 analysis (released May 2025) shows continued integration of CA with static knowledge — questions increasingly require both. Pure CA questions (where knowledge of the event alone answers the question) are declining; integrated CA-static questions (where the event provides context and static knowledge answers the question) are rising. This reinforces the importance of the integration approach over purely tracking current events.

The Events That Transcend the Window

Certain categories of events become permanent static knowledge regardless of when they occurred:

Constitutional amendments — all amendments from 1st (1951) to present are always in scope
Landmark Supreme Court judgments — Kesavananda Bharati, Vishaka, Maneka Gandhi, K.S. Puttaswamy (privacy) — always relevant
Major international treaties — Paris Agreement (2015), RCEP, QUAD formalisation — become static after ratification
Scheme launches that remain operative — PM-KISAN (2019), Ayushman Bharat (2018) — remain current affairs in the sense that budget, beneficiaries and amendments are testable
BRICS, SCO, G20 membership changes — India's G20 presidency 2023 events remain relevant for Mains 2026

Common Mistakes on the CA Window

Mistake 1: Starting intensive CA coverage 3 years before the exam. The information will decay from memory before the exam. Intensive CA coverage more than 20 months before the target exam date is not productive — events from 3 years ago will have low salience by exam time.

Mistake 2: Starting intensive CA coverage 3 months before Prelims. Insufficient time to build context. You need 12–18 months of real-time CA consumption to understand why events matter, not just what they are. A three-month crash course produces fact-recall without analytical depth.

Mistake 3: Treating the window as a hard cutoff. UPSC does not announce CA cutoff dates. The window is a probabilistic guide — cover the core 12 months comprehensively and the extended 18 months adequately, but do not assume events from 20 months ago are safe to skip.

How to Plug CA Gaps With Magazine Archives

If you have gaps in your CA coverage for any month, use magazine archives:

Vision IAS Monthly archive: visionias.in/current-affairs/monthly-magazine/archive
Insights Monthly archive: insightsonindia.com/current-affairs-downloads
ForumIAS EPIC archive: forumias.com/blog/monthly-current-affairs-pdf-for-upsc-ias-examination

All three maintain free archives of past issues. Reading the Insights Monthly for a missed month takes 2–3 hours and provides comprehensive coverage of that month's events.