Sorry to say according to your percentage you will not be eligible to get admission at BITs.

Eligibility for BITSAT:-

• Candidates must have passed class 12 or equivalent examination (from any state or central board of school education)

• They should have secured at least 75% aggregate marks in the qualifying examination with Physics, Chemistry and Mathematics/Biology.

• Apart from the 75% aggregate marks, they should have scored 60% marks separately in each of the three subjects.

• Proficiency in English is another requirement for appearing in BITSAT 2018 .

• Only those candidates, who have cleared/passed class 12th or qualifying examination in the year 2017 or are appearing in 2018 are eligible for appearing in BITSAT 2018.

All the very best and good luck.

As far as I know you can't be eligible to get admission into BITS until and unless you have at least 75% as your PCM aggregate it's in their eligibility criteria and if not you may give the exam but you wouldn't get admission i fear I had a PCM aggregate as 72 and an overall percentage, 86 still I won't able to make it. Correct me if I am wrong .

Good Luck!!