MockTezNegative Marking: How to Decide When to Guess
A clear explanation of how negative marking works in objective exams, how to calculate whether a guess is worth it, and how to practise smart attempting in mock tests.
Many competitive exams in India deduct marks for wrong answers. This rule, called negative marking, changes how you should approach questions you are unsure about. Guessing blindly can pull your score down, but refusing to attempt anything uncertain can leave easy marks on the table.
This guide explains the logic so you can make better decisions. The exact marking scheme varies by exam and can change between years, so always confirm it in the official notification for your exam.
How negative marking works
In a typical scheme, each correct answer earns a fixed number of marks and each wrong answer loses a fraction of that. For example, if a correct answer gives 2 marks and a wrong answer deducts 0.5 marks, the penalty is one quarter of the reward. Unattempted questions usually score zero.
So your final score is: (correct answers × marks per question) minus (wrong answers × penalty).
The basic maths of guessing
Imagine a question with four options and a penalty of one quarter of the marks. If you guess completely at random, you have a 1 in 4 chance of being right. On average, out of four random guesses you get one right and three wrong.
With a reward of 1 mark and a penalty of 0.25, that is 1 − 3 × 0.25 = 0.25 marks for four guesses. Random guessing gains a little on average, but the result is very uncertain.
Now suppose you can confidently eliminate two options. Your chance of being right becomes 1 in 2. Out of two such guesses, you expect one right and one wrong: 1 − 0.25 = 0.75 marks. That is a much better bet.
If the penalty is one third of the reward instead of one quarter, a fully random guess on four options gains nothing on average: 1 − 3 × (1/3) = 0. In that case a pure blind guess is not worth it, but an educated guess after eliminating even one option is.
The lesson is simple: the more options you can rule out, the more a guess is worth.
Educated guesses vs blind guesses
A blind guess is when you have no idea and pick any option. An educated guess is when you have eliminated at least one option for a real reason. For example, in a maths question you might check that the answer must be even, or that it must be less than a certain value. In general awareness, you might know that one option belongs to a completely different period of history.
Train yourself to look for elimination clues. In quantitative questions, checking unit digits, divisibility or rough estimates can remove wrong options in seconds.
Accuracy is a skill you can measure
Your mock tests are the best place to learn your own guessing accuracy. After each test, look at the questions you were unsure about. How many of your educated guesses were correct? If your educated guesses are right more often than not, you can attempt them more freely. If most are wrong, you need to be more careful.
On MockTez you can choose a negative marking setting before you start a test (none, 1/4, 1/3 or 1/2 of the marks), and the result page shows your correct, wrong and unattempted counts so you can see how penalties affected your score.
A simple decision rule
Here is a practical rule many aspirants use:
If you know the answer, attempt it.
If you can eliminate two options with confidence, attempt it.
If you can eliminate only one option, attempt it only if the penalty is small and you are not already low on accuracy in that section.
If you cannot eliminate anything, skip it and use the time on another question.
Adjust this rule based on your mock test data. There is no single correct approach for everyone.
Avoid the panic attempt
A common mistake happens in the final minutes, when candidates rush to mark answers for every remaining question. In an exam with negative marking this can undo a lot of careful work. If you want to use the last minutes, return to questions where you had narrowed down the options rather than guessing on untouched ones.
Balance attempts and accuracy
Two candidates can reach the same score in very different ways: one attempts fewer questions with high accuracy, the other attempts more with lower accuracy. Both are valid, but high accuracy is usually more reliable. As your preparation improves, your goal should be to increase attempts while keeping accuracy steady.
Use every mock test to watch these two numbers. Over time, you will develop a feel for when a guess is worth taking, and that judgement can be worth several marks on exam day.