I think you are asking for the eligibility criteria of JEE-MAINS.So, for that you should have obtained a minimum of 75% marks in class 12 or equivalent exam or they must be in the top 20 percentile in their class 12 examination. For SC/ ST, the eligibility is to obtain a minimum of 65% marks in class 12 or equivalent.For more info. visit  https://engineering.careers360.com/articles/jee-main-eligibility-criteria

Hope this helps.

Hello aspirant!  Let me to inform you that according to the rules for giving the entrance exam you do not need any kind of percentage marks.  Once you give the exam and qualify it then during admission in any college you will have to have more than 75%  marks in the physics chemistry and mathematics overall then only you can get admission.