Hello pradeesha,

There are some best colleges offering bsc microbiology in Tamil Nadu:-

•Bharathidasan University - [BU], Thiruchirapalli

•University of Madras, Chennai

•Bharathiar University - [BU], Coimbatore

•Periyar University, Salem

•Thiruvalluvar University - [TU], Vellore.

•Madurai Kamaraj University - [MKU], Madurai.

I hope this helpful for you.

Best wishes!!