Science

Bachelor's degree in engineering, biological sciences, physical sciences or mathematics from an accredited college or university. Three years of related professional experience after obtaining the Bachelor's degree or at least 1,000 hours in JET aircraft as the pilot in command.

Chandigarh University is a whole private institute and yes, it offers a course in biotechnology under B.Sc-IT.
http://www.cuchd.in/biotechnology/bsc-biotechnology.php

You need to have a Bachelors degree in respective subjects like Botany, Genetics, Biochemistry, Microbiology, Genetics, Biotechnology, Life Sciences, Molecular Biology and Biomedical Sciences in Science stream. So, yes, you are eligible to apply.

Reva University
The Oxford College of Science
Christ University
AIMS Institutes
ASB - Amrita School Of Engineering Bengaluru
To see the course related details, please click the link- https://www.shiksha.com/science/colleges/m-sc-colleges-bangalore.

CUCET 2019 application form will be available from 19th February, only via online mode and the last date for submission will be 26th March.

Here is the link where you can see some of the best books and order, to prepare for B.Sc in Maths entrance exam of BHU- https://www.amazon.in/B-Sc-Math-Group-Entrance-Exam/dp/

Yes, you can, since the minimum aggregate score in PCM, has to be 60%.

Go through the CUCET dates below for details:
https://www.shiksha.com/science/cucet-exam-dates.