You need 100 marks that is quite easy if you do some little extra efforts now for exam.
I assume that you have a good knowledge of 11th and 12th ncert level.
First of all grab chemistry as much you can because it will only help you because in jee mains questions in jee mains are from ncert.
And you can easily get up to 50- 60 marks.Then choose next subject which you feel easy then select some chaptars in which you have some pre knowledge and practice questions and previous years paper and do the third subject also this way. I can surely say you can achieve more than 100 marks in Mains.

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