Mastering 72nd BPSC Prelims: Option E ("Not Attempted") & -0.33 Negative Marking Scoring Mathematics
The ultimate tactical guide to mastering BPSC’s -0.33 negative marking and Option E ("Not Attempted") bubble. Learn probability-based elimination rules, risk management, and score maximization on the 150-question paper.
1. Evolution of BPSC Negative Marking Architecture
Starting from the 68th and 69th CCE, BPSC instituted -0.33 marks (1/3 deduction) for every incorrect answer. Furthermore, Option E was redesignated as "Not Attempted" to eliminate ambiguous blank bubbles and prevent OMR tampering.
Under this rule: +1.0 for Correct, -0.33 for Incorrect, and 0 for Option E.
2. The Mathematics of 50/50 Elimination vs Blind Guessing
Pure blind guessing across 4 options has a 0.00 mathematical expectation. However, when you eliminate 2 incorrect distractors, your probability of success is 50%, generating +0.335 net marks per attempt.
Consistently applying calculated elimination across 20 questions yields ~+6.7 net marks—frequently the exact margin separating selection from disqualification.
3. How to Use Option E ("Not Attempted") to Protect Scores
When facing questions in completely unfamiliar subjects where no distractors can be eliminated, mark Option E. Skipping 25-30 questions with Option E prevents 8 to 10 marks from being erased by negative penalties.