Make deliberate decisions under negative marking

Start with the actual scheme

Read the official instructions for the paper you will attempt. Different exams use different penalties, and some sections may have special rules. Do not import a marking scheme from a different test. Our editorial quizzes clearly display their own practice scheme; it is not a claim about any recruitment exam.

If a correct answer earns R marks and a wrong answer loses P marks, a guess with probability p of being correct has expected marks pR − (1 − p)P. A blank earns zero under the usual unanswered-zero assumption. The break-even probability is P divided by R + P.

Apply the calculation with humility

For a practice scheme of +1 and −0.25, break-even is 0.25 ÷ 1.25 = 0.20. That calculation does not mean every uncertain guess is wise. Your estimate of p may be poor, and reading the question consumes time that could earn marks elsewhere.

Eliminating an option for a clear reason is stronger evidence than a feeling of familiarity. State that reason mentally. If you cannot, your apparent confidence may be noise. Keep track of high-, medium- and low-confidence answers in practice to discover how well your confidence matches actual accuracy.

Protect the opportunity cost

Use an initial pass to answer questions you can resolve efficiently. Flag questions that need more work and return after securing accessible marks. The order is a personal practice choice; respect navigation restrictions and sectional timing in the actual exam.

During review, compare the time and outcome of uncertain attempts. A difficult question is not automatically worth more attention. Improve the underlying skill in study time, then test whether the decision becomes faster and more accurate.

Audit the rule after the test

Write down how many guesses were grounded in elimination, how many were blind and what each group scored. Use several practice sessions before changing your strategy. Expected value concerns repeated decisions; a single lucky guess proves little.