I assume you are talking of your coaching class papers as this is what I assume seeing the request number.

So first of all make a table saying how many questions you got right, how many wrong, and how many you couldn't attempt.

The first number tells how much you know. The second one tell how much you know wrong, and the third one tells how much you don't know.

See the wrong one's first. See what the mistakes were. Was it a silly mistakes? Calculation error? Wrong knowledge? Overconfident 'tukka'? Conceptual misunderstanding?

Try to reduce these everytime. See where you lose marks. Devise strategies to avoid them(e.g.- writing incorrect/correct infront of options to make sure you don't go wrong in the 'incorrect' type questions.

As of those you couldn't do, see what exactly you didn't know. Was it too tough for you? Was it your slow speed? You didn't remember the reaction? You forgot the formula?

Work on it. Learn whatever you didn't get. Improve speed by solving homework fast. Inprove your temperament.

Try impoving with each paper. JEE 2018 is close. If the reader is an aspirant, time to be prepared.

I can make this answer longer, but I leave the rest to the reader to discover(standard NCERT reference to avoid writing more :p)

Seize the moment.

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