The Admission for bcs forensic science does not depends on your 12th percentage.Because now-a-days the students percentage does not matter. the thing that matters is your knowledge. See there are many university or the colleges which conduct their own entrance papers and just you have to clear the exam to take the admission in the college.
There are many Top entrance exams conducted like JET, Amity JEE, LPUNEST, and other University or State level Entrance Exams .But there are only some colleges which take admission according to the merit based.So Don't worry prepare well for your entrance exam.
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Coming to the question ,If you belong to PCB/PCM background and passed you 12th with a minimum of 55% aggregate marks in PCM/PCB then you are eligible to pursue B.sc Forensic sciences.
In order to get admission into the college you will have to write the specific entrance tests.
For more information regarding the course you can visit: https://university.careers360.com/articles/5326-Career-review-Forensic-Sciences