Total of 90 question is asked in JEE Mains, 30 each in Physics, Chemistry, and Mathematics.

For each correct answer:- +4 marks

For each wrong answer:- -1 mark

All the very best and good luck.

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JEE Main exam consist of total 90  question.  Out of which 30 questions are from chemistry   30 Q are from physics and 30 are from Math.      It also have negative marking. You will get 4 marks for 1 right question and get -1 marks for  1 wrong question. For example :- if you attempt  2 questions out of which 1 is right and 1 is wrong  . Than your total marks will be :- 4-1=3 that means 3 marks.                                  

I hope you understand. Best of luck for your future buddy!