B.Sc Microbiology

It depends on the following factors:
The reputation of the college.
Placements that the college offers.
Technical atmosphere in the college.
The skills promoted there.
Its links with companies.
Fees.
For example, BITS-Pilani is a private college but is much better than many other government colleges. On the other hand, IIT Delhi is a leading institute for sciences, but it is a government funded institute. Regards.

Top 5 colleges for B.Sc. In microbiology are mentioned below:
1) All India Institute Of Medical Sciences - [AIIMS], New Delhi
2) Christian Medical College - [CMC], Vellore
3) Armed Forces Medical College - [AFMC], Pune
4) Kasturba Medical College - [KMC], Mangalore
5) Maulana Azad Medical College - [MAMC], New Delhi
Regards.

Some top colleges for M.Sc. In Virology are as follows:
1) Sri Venkateswara University : Department of Virology, Tirupati
2) Amity Institute of Virology and Immunology, Noida
3) National Institute of Virology (NIV), Pune
Regards.

Top companies for internship of Microbiology graduates are:
Mascot International
Siron Technology Pvt. Ltd.
Alpha Pharma Healthcare India Private Limited
Krauter Healthcare Limited
The Indian Hotels Company Limited
Lakshmi Life Sciences Ltd.

Please refer to the link provided below for details regarding entrance exams conducted for M.Sc. courses across the country. You should be able to select a entrance exam relevant to the course you want to pursue.
https://www.shiksha.com/science/articles/top-bsc-msc-entrance-exams-in-india-blogId-13484