Hello aspirant,
Hope you have got few idea about colleges in tamilnadu,while you searching through internet.Apart from that,you can get some personalized recommendations of the known person,whether the things in the college suits you well.
Apple looks beautiful only
when it is in the right place .
Choosing the unique path and pursuing it surely get you to succeed.
So,let me come into your point,

1. Lok nayak jayaprakash narayan national institute of criminology and forensic science, delhi.
2. osmania university, Hyderabad.

The universities above are best in India.
Universities in Tamilnadu:

1. Karunya university,coimbatore.
2. AJK college of arts and sciences,coimbatore.
3. MGR.university,chennai.

I will enlist down below some of the top UG degree Bsc forensic colleges in Tamil Nadu -

1. Karunya Institute, Coimbatore
2. Mary Matha college, Theni
3. AJK college of Sciencce, Coimbatore
4. Madras medical college, Chennai
5. Stanley medical college, Chennai

Refer to the website below for more detailed information...

https://medicine.careers360.com/colleges/list-of-forensic-medicine-colleges-in-tamil-nadu

Best wishes thank you.