Can a person from commerce i.e bcom background can score 95-100 percentile in CAT?

Hy tej,
A man can do everything whatever he perceives.
Yes my friend he can score even 100 percentile in cat.
I admit that cat results are being dominated by engineers but if you can score good percentile in cat being from commerce background then you will get a upper hand in academic diversity quota given by many b schools and iims.
It totally depends upon your dedication and knowledge.

CAT cutoff will depend upon various factors. Some of the factors determining CAT cutoff can be mentioned as follows:

Difficulty level of exam

Number of test takers

Number of candidates qualifying for the next rounds

Number of seats

Institute repute or ranking
I wish you all the best for your cat exam.
Cheers !!

Yes Definitely. Even B Schools want students with Non engineering background in their institute to promote academic diversity. The pattern and difficulty  level of the CAT Exam is also changing slightly every year so that non engineering students have no disadvantage while appearing for the examination.
Colleges also give some extra marks to students with non Engineering backgrounds during their selection process.
There are a good number of B. COM graduates studying in the top B Schools of the country.

So you should prepare your best and try to score a high percentile in the examination.
All the best!