Hey subhas in order to pass in Chemistry and physics  theory paper of 12th standard, you must have to score at least 35% marks out of total marks .
A ll the best or your upcoming exams.

Hii

Assuming that you are talking about the Physics and chemistry of Class 12th boards level . SO the passing maarks for Chemistry as well as physics out of the maximum marks that is Seventy is Twenty Three . 23/70 . And for practicals of both of them out of thirty the passing marks is ten 10/30.

Hope it helps

Thanks