SSC CHSL Tier 2 strategy

In Tier 2, every right answer is worth 3 marks and every wrong answer costs 1. That single change makes it a different exam from Tier 1.

Take two candidates who both get 90 questions right. The first attempts 100, so 10 are wrong: 270 − 10 = 260. The second attempts 115, so 25 are wrong: 270 − 25 = 245. The first candidate answered fewer questions and ranks higher. Tier 2 rewards accuracy more than reach, and because it decides your merit, every mark here matters.

The structure

Two things follow from this. First, each section gives you 60 questions in 60 minutes, about a minute per question, which is more than Tier 1's 36 seconds. The extra time is there because the questions are longer. Second, within Sections I and II, the two modules share one clock, so you decide how to split the hour.

The maths of negative marking

A blind guess gains nothing on average and adds risk. Guessing becomes worthwhile only once you have genuinely ruled out an option. The honest rule for Tier 2: attempt when you are confident or down to two options, and skip the rest without guilt.

Module approaches

Mathematical Abilities (30 questions, 90 marks)

• Solve arithmetic first: percentage, ratio, averages, profit and loss, interest, time and work, speed and distance. These are the most reliable marks.
• Attempt geometry and trigonometry when the method is clear to you within the first 15 seconds of reading.
• For algebra, substitute values. For example, if a question says a + b = 5 and ab = 6 and asks for a² + b², use (a + b)² − 2ab = 25 − 12 = 13, or simply note a = 2, b = 3 and check: 4 + 9 = 13.
• Recheck any answer that came from a long calculation. A slip costs 4 marks in effect: the 3 you didn't get and the 1 you lost.

Reasoning (30 questions, 90 marks)

• The most scoring module for well-practised candidates. Aim to attempt nearly all.
• Draw for blood relations, directions and seating arrangements. Diagrams prevent the most common errors.
• A sensible split of Section I: about 25–30 minutes for reasoning, leaving 30–35 for maths, which needs more calculation.

English (40 questions, 120 marks)

• The largest module in the whole of Tier 2.
• Order: vocabulary, then grammar, then passages and cloze.
• Don't guess unknown words. Vocabulary questions are exactly where "down to two options" rarely happens honestly.

General Awareness (20 questions, 60 marks)

• Answer quickly and skip unknowns.
• GA usually needs 10–12 minutes of Section II. The remaining time goes to English.

Dividing time in Section II

English and GA share an hour. Two approaches work:

1. GA first: answer the 20 GA questions in about 10 minutes, then give English the remaining 50 minutes with a clear head.
2. English first: tackle English while fresh, then finish GA quickly at the end.

The risk with English first is spending too long on a passage and rushing GA. The risk with GA first is dwelling on doubtful facts. Try both orders in mocks and keep the one that gives you higher accuracy.

A worked target scorecard

Suppose an aspirant sets these targets for a mock:

Notice the aspirant leaves 16 questions untouched and still scores 272 of 360. Accuracy across the attempted questions is 94 out of 104, about 90%. That is the kind of profile Tier 2 rewards. Whether 272 is enough depends on the year and the post, so read how CHSL cut-offs work rather than trusting any single number.

The weeks between tiers

Don't wait for the Tier 1 result. The gap between the two can be short, and the candidates who start early walk in with far more Tier 2 mocks behind them.

If you have more than four weeks, repeat weeks 2 and 3 with more mocks.

Computer knowledge and the skill test

• Computer Knowledge (15 questions, qualifying): computer basics, MS Office, internet, email and security. It carries the same −1 negative marking. The qualifying mark differs by category, so check your notification. Two or three weeks of revision is usually enough. See our computer knowledge guide.
• Typing (LDC/JSA): 35 wpm in English or 30 wpm in Hindi, in 10 minutes.
• DEST (DEO): 8,000 key depressions per hour for most offices, 15,000 for a few, in 15 minutes.

Practise typing every day for 20–30 minutes in the months before Tier 2. Our guide to the typing test for LDC/JSA explains how it is scored.

Practice

1. Calculate the score for 110 attempts with 95 correct.
2. What is the expected value of a guess after eliminating one option?
3. If a + b = 7 and ab = 10, find a² + b².
4. Which two parts of Tier 2 are qualifying?
5. Section I has one hour. If reasoning takes 27 minutes, how long is left for maths, and how much time per question?

Answers:

1. 95 × 3 − 15 × 1 = 285 − 15 = 270.
2. (1/3) × 3 − (2/3) × 1 = +0.33 marks.
3. 49 − 20 = 29 (check: a = 5, b = 2, so 25 + 4 = 29).
4. Computer Knowledge (Section III) and the skill test (Session II).
5. 33 minutes for 30 questions: 66 seconds per question.

What to do next

• Take one full Tier 2 mock and fill in the scorecard above.
• Decide your Section II order after trying both in two mocks.
• Put 20–30 minutes of typing into every day from now.
• Revise computer knowledge for two weeks before the exam.