Hello Manikandan,

The top colleges offering BSc computer science in Chennai are

Loyola college Chennai

Queen Mary's college

College of Engineering (CEG)

Sri Ramachandra institute of higher education and research

SRM Institute of technology (SRM IST)

You can select a college suitable for you and visit their official website for application process. Most if not all these colleges offer their seats based on merit alone. You can find further information on the course in your preferred location in the link provided below. Hope this helps and Good luck

https://university.careers360.com/colleges/list-of-bsc-in-computer-science-degree-colleges-in-chennai