While preparing for such tests, test takers usually have one sole objective: obtaining a high raw score. It entails the identification of the syllabus, understanding of the complicated formulas, and maintaining accuracy through practice tests. But the aim is always to answer as many questions as possible. With time pressure and desperation to score more, candidates find themselves trapped in a psychological error – that of taking guesses on the difficult questions. A penalty point of 0.25 for answering a question wrongly seems to be a small matter that they should pay attention to.

However, this shows a lack of knowledge of the workings of competitive exams. Negative marking not only reduces your raw score, but in competitive screenings where there is a densely packed percentile distribution, it destroys your percentile. In today’s competitive screening exams, there is a crowd of people with the same score ranges. Due to the intense competition, even a single mark lost can take your percentile several hundred positions down. To secure your selection chances, you need to know the four-point strategy behind how negative marking breaks your percentile.

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How Negative Marking Quietly Ruins Your Percentile 

Read the following pointers to learn about how negative marking quietly ruins your percentile:

The Statistical Double Jeopardy Effect

Quite often, candidates analyze the negative marking factor and do their sums poorly. The reason is that they feel like their wrong guess will cost them a mere portion of the point (for example, 0.25). In case you get a question wrong, you won’t only lose 0.25 points but also the entire 1.0 point you could earn for providing the right answer, plus the penalty charge. Your raw score trend line will drop by 1.25 marks compared to the mark line it is supposed to be on. 

Activation of the Normalisation Algorithm Penalty

Almost all significant computer-based exams conducted over multiple days use an intricate mathematical formula for normalisation of the level of difficulty between shifts. While the specific formulas used by testing bodies remain proprietary knowledge, one of the essential factors considered by most of the normalisation algorithms is the accuracy ratio, which is a combination of how many questions you answer and how many you have right.  

In case you answer 90 questions but make 30 mistakes because of heavy guessing, your poor accuracy ratio will alert the algorithm about your excessive reliance on pure chance. While normalising the scores between various shifts, your raw score will likely be adjusted much more than your competitor’s, who managed to answer 65 questions, with 63 being correct. 

Cannibalising Your Strengths Through Their Hard Work

Consider working for one hour, showing perfect implementation of concepts in your strongest topic, thereby earning yourself a solid block of correct answers. But in the last ten minutes, you feel yourself panicking and realise that there is still a block that you haven't attempted much due to its weakness. So, in a bid to boost your grade, you make eight guesses in that particular area. But what if six out of those eight guesses are actually incorrect? That will mean that your poor guesses would have penalised you with negative marking from your strong section, thereby cannibalising your strengths through their hard work.    

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Conclusion

Cracking a competitive examination in today's world calls for a paradigm shift of the absolute kind: you will need to know how to appreciate the questions left untouched as much as the ones you attempt. Give up looking at the test paper as a challenge to get through all the questions. View your raw score as a valuable asset that needs to be jealously guarded against any negative scoring. Do some hard tests on your practice papers to understand your own level of success rate when it comes to guessing, and then have the guts to leave out the tricky questions rather than risking a wrong guess.