Hello!
Some top colleges that offers bioinformatics course in Bangalore and Chennai are listed below:-

Reva University, Bangalore
Dayananda Sagar University, Bangalore
Sathyabama Institute of Science and Technology,Chennai
University of Madras, Chepauk, Chennai
B.S. Abdur Rahman Crescent Institute of Science and Technology, Chennai
Stella Maris College, Chennai
Mohamed Sathak College of Arts and Science (MSCAS), Chennai

All the best!