Science

Your rank would be between 20-30k.

You need to appear for MAH-MCA-CET:
Eligibility criteria for appearing to MAH-MCA-CET:
a) Passed with minimum 50% marks in aggregate or equivalent CGPA (45% in case of candidates of backward class categories and physically handicapped) of minimum three years duration in any discipline.
Candidates who have passed BCA, BCS or B.Sc (Computer/information Technology) degree courses are not required to fulfill the requirement of having studied mathematics or statistics as one of the subjects at 10+2 level or higher level examination.
b) Valid score of MAH-MCA-CET conducted by the competent authority.

You may get a good college but you can use Shiksha college predictor tool for finding colleges:
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor?utm_source=cconnect&utm_medium=CR_JEECP&utm_campaign=5836167

It's better if you change maths in your main subjects, as it will help you more regarding your 12th score and getting admission in your dream colleges.

Bengaluru is home to many good colleges. However, to know which college options are open to a student, one must know the student's 12th grade marks as well. 12th grade marks hold more value and importance in college admissions than the 10th grade marks.

There are few chances of getting admission in Heritage college Kolkata for Biotech. So keep a check at counselling round and you will get a seat. All the best for future.