UPSC Prelims Test Series

How negative marking is applied

The engine reads the marking rule from each question rather than assuming one, because the decision-making questions in the 2014 and 2015 CSAT papers carried no penalty at all. The standard rules are these.

Two consequences worth internalising. First, CSAT marks above 66 are worth nothing — 27 correct answers with nothing wrong clears it, and every further hour spent there is an hour not spent on the paper that ranks you. Second, the penalty is exactly one third of the marks, which fixes the arithmetic of guessing:

A blind guess is worth exactly zero, on average, in both papers — it is neither the disaster nor the free lottery ticket it is usually described as. Ruling out even one option turns it positive. That is the whole of guessing strategy, and it is arithmetic rather than advice. Your result screen therefore reports correct, wrong and unattempted separately, and states the marks lost to negative marking as a number instead of folding them into the total.

One full explanation, so you can judge the rest

This is not a sample written for this page. It is question 63 of the 2023 GS paper, rendered from the same database row a test uses, and every one of the 2,261 questions is written to this standard. Assertion-reason is the format where it matters most: the answer key alone tells you nothing about why a true Statement-II can fail to explain Statement-I.

The explanation

• •Statement-II is correct: in the hot, humid conditions of tropical rainforests, dead leaves and organic matter decompose within weeks, releasing nutrients rapidly.
• •Statement-I is incorrect: the released nutrients are immediately taken up by the dense vegetation or leached away by heavy rain, so rainforest soils (oxisols, laterites) are typically thin, acidic and nutrient-poor; the nutrients are stored in the living biomass, not the soil.
• •This is why cleared rainforest land loses fertility within a few years.
• •Rapid decomposition in fact explains why the soil stays poor — the opposite of Statement-I.
• •Hence Statement-I is incorrect but Statement-II is correct, option (d).

Note what it does beyond naming option (d): it gives the mechanism (rapid decomposition, immediate uptake and leaching), names the soils, and supplies the transferable fact — cleared rainforest land loses fertility within a few years — that lets you answer a differently-worded question on the same idea in a later paper. Explanations are written against government sources: NCERT, NIOS and IGNOU texts, the Economic Survey, the Constitution and PIB releases.

You do not have to take our word for the other 2,260. They are readable without an account: start with the 2026 paper.

What the error notebook does

Every question you get wrong is added automatically and stays until you get it right twice, on separate attempts — once can be luck, and under this marking scheme a lucky guess is worth zero anyway. The notebook keeps the question, the option you chose, the correct option and the explanation together, so revision is a list of your own mistakes rather than a second pass over a whole paper you mostly got right. Bookmarks and your own notes live in the same place. Nothing is deleted when a test ends.

The reason it is built this way: in a 100-question paper, the difference between a clearing score and a near miss is usually fifteen or twenty questions you half-knew, not the fifty you never knew. Those are the ones a notebook can actually recover.

What is free and what costs money

Stated plainly, because a test series page that hides its price is wasting your time.

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