Talking about BSC microbiology, I don't know the best college in Tamilnadu but Chandigarh University in North India is the best University. They provide quality education and all the staff are highly qualified. Chandigarh University is NAAC A+ accredited university . Every year no of companies visit the campus for the placement.

It also provides 100 % scholarship to the students by appearing in the CUCET exam. It is compulsory to appear for the cucet exam to take admission in cu. It also provides semester exchange program where the students can take 2 semester in the home country and the other next semester in the foreign country.

The atmosphere at University is very good. It has good infrastructure and wifi campus. Students get numerous opportunities and become all rounder. So it the best University to pursue any degree.

Here are some of the colleges you can prefer for B.Sc Microbiology given below:

Dhanalakshmi Srinivasan College of Arts and Science for Women 

Srinivasan College of Arts and Science, Tamil Nadu

The other collegs you can prfer near by place are

Hindustan College of Arts and Science, Kelambakkam, Chennai

The American College, Madurai

Good Luck!