B.Sc

It is about INR. 10,000 to INR. 16,000 per year, depending upon your subject and college + about 1000 per semester as your examination fee.

He is eligible for M.Sc Biotechnology in well reputed universities like Nirma University, VIT-Vellore, and SRM- Chennai, if he passed entrance exam which is organized by these universities. Although, he can also apply for IIT JAM because some IIT institutes offer biotechnology courses and M.Sc. Ph.D. integrated courses, for those students who have completed their Science graduation without Maths.

According to your score and percentage the colleges under DU will be perfectly fine. So you can try applying under DU to get admission.

You have taken a very bright and wise decision to choose microbiology for your B.Sc. This subject has tremendous scope in future. With the aim of government. To double farm income, this is going to help in this.

Hello Anil,
The total fee of this course at UEI Thiruvananthapuram is around 1.90 lakhs for 3 years. Please check here for more details.
https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.shiksha.com/college/amp/uei-global-thiruvananthapuram-36358&ved=2ahUKEwjI2bvYi4fhAhVhguYKHUpZApAQFjACegQIBBAB&usg=AOvVaw0Fgw8DRF9401xvCMtv77jV&cf=1&cshid=1552754111636
All the best.

Opt for M.Sc in medical microbiology. It has a good scope.

Yes surely you can pursue after doing your Bsc. The best colleges for this course are:
Tamil Nadu Agricultural University Coimbatore
Jawaharlal Nehru Krishi Vishwa Vidyalaya
Mewar University
Lovely Professional University Punjab
Anna University
Acharya Ngranga Agricultural University Hyderabad
Govind Ballabh Pant University of Agriculture and Technology, Pantnagar
Mahatma Phule Krishi Vidyapeeth Puneoknete
Mohanrao Kadam College of Agriculture Sanglisardar.

Delhi University, IPU and some private universities like Amity University are the good options to pursue B.Sc.

If you have good grades in 12th, you will easily get admission there. Just calculate your best 4 and check whether you are eligible for the courses by seeing the cut-off on the DU official website (or check if any entrance test is there for the courses you have mentioned, on the official website of DU).
The fee is very less since they are government colleges.

Apply for DU in June-July when registrations start. It offers B.Sc in Botany and B.Sc in Zoology.