Dear Siddartha
It's okay to have fear about that. But what I can suggest is if you can buy RD. sharma books. These YIU can find the basics and also the advanced topics.  And what I want to say is you need to practice different models and also take mock tests too.
If you have any doubts,  comment here.

All the best.

Practice,practice,practice and only practice that too with a constant eye on your watch sp as to maintain speed in solving.process should be:first understand the theory and concept,then mug up the common formulae,take a jee main level question bank and solve within a given time limit

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