West Bengal PSC – Foundation Exam
Topic: Marking Scheme
Why it matters
Understanding the marking scheme helps you allocate time, decide which questions to attempt, and estimate how many marks you need to qualify.
1. Simple Explanation
| Element | What it means | How it affects you |
|---|---|---|
| Paper‑1 | 60 multiple‑choice questions (MCQs) | 1 mark per correct answer, –0.25 marks for each wrong answer |
| Paper‑2 | 60 single‑answer questions (SAQs) | 1 mark each, –0.33 marks for each wrong answer |
| Paper‑3 | 40 true/false questions | 1 mark each, –0.25 marks for each wrong answer |
| Paper‑4 | 30 questions from any of the above categories | Same marking as the category of the question |
Key rule – No negative marks for unanswered questions. Leave a question blank if you’re not sure.
2. Key Points
| # | Point | Why it’s important |
|---|---|---|
| 1 | Total marks | 1000 marks – 200 per paper (Paper‑1 to Paper‑4). |
| 2 | Question types | MCQs, SAQs, True/False. Practice each type separately. |
| 3 | Negative marking | 0.25 for MCQ/True‑False, 0.33 for SAQ. Knowing this helps you decide whether to guess. |
| 4 | Answer strategy | 1. Try to answer all questions you’re sure of. 2. For risky questions, compute expected value before guessing. |
| 5 | Time management | Paper‑1 & Paper‑2 are usually 1 hr 30 min each. Paper‑3 & Paper‑4 are 1 hr each. |
| 6 | Pattern of questions | Easier questions appear first; harder ones toward the end. |
| 7 | Qualification cut‑off | Usually 40–45% of total marks. Keep track of how many marks you need. |
| 8 | Answer key | Answers are given in the answer sheet. No partial credit for wrong answers. |
3. Worked Example
Scenario
You’re tackling a Paper‑1 question bank of 60 MCQs. After a quick review of a question, you’re not confident about the answer.
| Action | Expected value if you guess | Decision |
|---|---|---|
| Answer | Probability of being right = 1/4 (since 4 options). Expected marks = (1 × 0.25) – (0.25 × 0.75) = 0.25 – 0.1875 = 0.0625 marks | Positive but very small; better to skip if you have time for other questions. |
| Leave blank | 0 marks | Usually safer. |
Another situation
You’re on Paper‑2 (SAQ) and you have only 30 seconds left. You can’t solve the question but you’re 70% sure of one answer.
| Action | Expected value if you guess | Decision |
|---|---|---|
| Answer | Probability 0.7 × 1 – 0.3 × 0.33 = 0.7 – 0.099 = 0.601 marks | Positive → Answer. |
Bottom line – Always weigh the probability you’re right against the negative marking. If the expected value is positive, gamble; if not, skip.
4. Quick Revision Summary
- Paper‑1: 60 MCQs → +1, –0.25
- Paper‑2: 60 SAQs → +1, –0.33
- Paper‑3: 40 True/False → +1, –0.25
- Paper‑4: 30 questions (any type) → Same as the question’s type
- No negative marks for unanswered questions
- Total marks: 1000 (200 per paper)
- Key strategy:
- Answer all certain questions.
- For uncertain ones, compute expected value:
- MCQ:
EV = (1/4) × 1 – (3/4) × 0.25 - SAQ:
EV ≈ (p × 1) – ((1‑p) × 0.33)(p = confidence %).
- MCQ:
- Skip if EV ≤ 0.
- Manage time: ~25 min per 20 questions in Paper‑1 & 2; ~15 min per 20 in Paper‑3 & 4.
Remember: The marking scheme is a tool, not a hurdle. Master it, plan your attempts, and you’ll maximize your score. Happy studying!