At that level you can get best practices - Sample papers will keep you alert about your preparation, and that is the best thing you can ask for.
Strong motivation if you do well in them - Sample papers are a double-edged sword. You do badly, you get really frustrated. No matter how well you do... and that success, no matter how insignificant you think it is, will fuel your hunger to succeed to whole new levels.
Best source of new questions - It takes a lot of effort to create questions rather than solving them. And thus, you will not find questions based on new concepts every second you open a book or study material.
Realization of mistakes - You do many things wrong when studying a concept for the first time. Or reading some stuff that is wrong. Everyone does this. It is important to understand these mistakes and correct them as soon as possible.
Help judge the competition - Alone and isolated, it's easy to get excited about the things you're capable of doing.
You will know your weaknesses and strengths, probably only after the first test paper - Every topic seems almost equally easy when you solve it from a book. In-depth knowledge of strengths and weaknesses is absolutely necessary to decide your strategy to attempt the paper.
Help you to remove silly mistakes - The best you can do is to practice more sample papers. Getting more used to the exam conditions will help you reduce these unnecessary errors.
Development of examination-temperament - The day the hard work, dedication and effort done during the preparation will have an equally big role on the day of the examination, the nature of the examination.
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