The Civil Services (Preliminary) Examination is the first hurdle in the UPSC CSE pipeline. It is conducted on a single Sunday in May with two objective papers — General Studies in the morning and CSAT in the afternoon. Understanding the Prelims pattern — question counts, marking scheme, qualifying thresholds, and negative marking — helps you calibrate attempt strategy and time allocation before exam day. The rules are restated each year in the notification on upsc.gov.in.
Key highlights
- Same-day, two-shift format: GS Paper I (morning) + CSAT Paper II (afternoon).
- GS Paper I: 100 MCQs, 200 marks, 2 hours — determines Prelims cutoff.
- CSAT: 80 MCQs, 200 marks, 2 hours — 33% qualifying (typically 80/200).
- Negative marking: −⅓ of question value for every wrong answer.
- One attempt counted if you appear in either paper.
Paper structure
| Paper | Questions | Marks | Duration | Role |
|---|---|---|---|---|
| General Studies Paper I | 100 MCQs | 200 | 2 hours | Merit — category cutoff applies |
| CSAT (General Studies Paper II) | 80 MCQs | 200 | 2 hours | Qualifying — minimum 33% required |
Both papers use multiple-choice questions with four options. GS Paper I covers current affairs, history, geography, polity, economy, environment, and general science. CSAT tests comprehension, interpersonal skills, logical reasoning, analytical ability, decision making, basic numeracy, and data interpretation.
The full GS topic list is in the UPSC syllabus guide. CSAT details are in the CSAT syllabus guide.
Marking scheme
| Outcome | Effect |
|---|---|
| Correct answer | +2 marks (GS Paper I); CSAT per official answer key |
| Wrong answer | −⅓ of the question's assigned marks deducted |
| Unattempted | 0 marks — no penalty |
Negative marking makes accuracy more valuable than blind guessing. A common strategy is to attempt questions you are confident about first, mark uncertain ones for review, and avoid random guessing on questions where you can eliminate fewer than two options.
For GS Paper I with 100 questions worth 2 marks each, three wrong answers cancel one correct answer's gain. Toppers typically attempt 75–85 questions with high accuracy rather than all 100 with mixed results.
Qualification logic
Prelims qualification requires both conditions to be met simultaneously:
- CSAT score ≥ 33% of total CSAT marks (typically 80 out of 200).
- GS Paper I score ≥ category-wise cutoff (General, EWS, OBC, SC, ST, PwBD).
A candidate with an outstanding GS score who fails CSAT is disqualified — this happens every year to aspirants who neglected aptitude practice. Conversely, clearing CSAT with a GS score below the cutoff also results in elimination.
Category-wise cutoffs are released with the Prelims result, usually in mid-June. They vary year to year based on paper difficulty and candidate performance distribution.
Exam-day schedule
On Prelims day, both papers are held at the same examination centre:
| Shift | Paper | Typical timing |
|---|---|---|
| Morning | General Studies Paper I | 9:30 AM – 11:30 AM |
| Afternoon | CSAT (Paper II) | 2:30 PM – 4:30 PM |
Candidates must carry their e-Admit Card and a valid photo ID. Electronic devices, study material, and watches are prohibited inside the hall. Reporting time is typically 30–45 minutes before each shift.
Attempt counting rules
Appearing in either Prelims paper — even if you leave one paper blank or walk out early — counts as one attempt against the maximum permitted attempts (6 for General/EWS, 9 for OBC, unlimited for SC/ST). This rule is stated explicitly in the annual notification. Plan your attempt calendar carefully, especially if you are near the age or attempt limit.
After Prelims: what happens next
The Commission releases Prelims results within three to four weeks, typically by mid-June. Qualified candidates (roughly 12,000–15,000) must then:
- Submit the Detailed Application Form I (DAF-I) within the notified window.
- Begin Mains-focused preparation — answer writing, optional depth, Essay and Ethics.
- Download the Mains e-Admit Card about two weeks before the Main Examination.
Track the UPSC 2026 calendar for result and Mains dates.
UPSC Relevance
Prelims is the largest funnel in the examination — lakhs sit, thousands qualify. Because marks do not carry to final merit, the goal is threshold crossing, not score maximisation. However, the discipline you build for Prelims (breadth, current affairs habit, time management) directly feeds Mains preparation. Treat Prelims as both a filter and a foundation.
Previous Year Questions
Prelims PYQ trends over the last decade:
- GS Paper I: Polity (15–20 questions), environment (15–18), economy (12–15), and current affairs (15–20) form the core. History and geography typically contribute 10–15 each.
- CSAT: Comprehension passages account for roughly 30–40% of questions. Logical reasoning and basic numeracy fill the remainder. Decision-making questions may or may not carry negative marking — read instructions carefully each year.
- Difficulty swings: Some years see unusually high cutoffs (e.g., 110+ for General); others dip to 95–100. PYQ analysis helps calibrate attempt strategy but cannot predict the cutoff.
Prelims Focus
Six months before Prelims, your weekly rhythm should include:
- Daily current affairs (45–60 minutes) overlaid on static subjects.
- Two GS mock tests per week with negative-marking review.
- Two CSAT practice sessions per week — comprehension and reasoning timed.
- Subject rotation: polity → economy → history → geography → environment → science.
In the final four weeks, shift to full-length mock tests simulating the two-shift day. CSAT practice should not drop below 20% of weekly study time even for humanities-background candidates.
Mains Focus
Prelims preparation builds the knowledge base that Mains expands. Topics you cover for Prelims GS — polity, history, geography, economy — reappear in Mains GS papers with greater depth. Start noting Mains-relevant angles (causes, consequences, multi-stakeholder analysis) while studying for Prelims, so the post-Prelims transition is faster.
FAQs
Is CSAT compulsory for all candidates?
Yes. Every candidate must appear in and qualify CSAT, regardless of educational background. There is no exemption for engineering or science graduates.
What happens if I qualify GS but fail CSAT?
You are not qualified for Mains. Both conditions must be met. This is one of the most common reasons strong GS performers miss the cutoff.
Can I use a calculator in CSAT?
No. Electronic devices including calculators, watches, and mobile phones are banned. CSAT numeracy is designed for mental or rough-work calculation.
How is the Prelims cutoff determined?
UPSC sets category-wise cutoffs based on GS Paper I marks after filtering candidates who cleared CSAT. The cutoff is the minimum GS score needed for qualification within each category.
Does blind guessing hurt my score?
Yes, significantly. With −⅓ negative marking, random guessing on four-option questions has negative expected value unless you can eliminate at least two options.
Key Takeaways
- Prelims is a same-day, two-paper objective test — GS Paper I for merit, CSAT at 33% to qualify.
- Negative marking (−⅓) makes accuracy essential; attempt strategically, not exhaustively.
- Both CSAT and GS cutoffs must be cleared — high GS with failed CSAT means elimination.
- One Prelims appearance counts as one attempt, even if you sit for only one paper.
- Prelims knowledge base directly feeds Mains — study with depth in mind from the start.