Hey

According to the eligibility criteria for BITSAT you must have scored a minimum aggregate of atleast  75% marks in Physics, Chemistry and Mathematics in your 12th boards or equivalent qualifying exam.

You also need to have scored a minimum of 60% marks in each of Physics, Chemistry, and Mathematics in 12th boards.

So if you aggregate in PCM is more than 75% you seem to be eligible. As your individual marks are more than 60% as required.

Best of luck