Hi Aspirant

Hope you are going to give your boards this year and you must be worried about your preparation.I am going to put some light on your doubts.

First off all you must know what you have to read i.e entire your NCERT books.If you are a PCM student ,first finish your course that is all the chapters from NCERT books.Once you are clear with all your doubts  buy some good practice papers like ARIHANT, Arihant sample papers are beyond expectation,they have good amount of question to practice and their sample answers are very standard.

So you have to do two things:

1.Finish your course from NCERT all sbjects

2.Sample paper practice and analysis of you mistakes

Once you are done with all of these you start giving mock papers.Either buy some books which only have mock and then you get it checked by your teachers .It will really help you.

All the best.