Hi, as you have 77 percentile in JEE mains so I will  help you to let you know the colleges you can get admission in CSE branch according to JEE mains marks percentile. According to the percentile most probably your rank ranges in between 230k-250k so the colleges in the below list will be accordingly;

• Pondicherry Engneering College(PEC), Pondicherry
• Ajay Kumar Garg Engineering College(AKGEC), Ghaziabad
• Dehradun Institute of Technology(DIT), Dehradun
• Chandigarh University, Chandigarh
• Lovely Professional University(LPU), Punjab
• Oriental Institute of Science and Technology, Bhopal
• Heritage Institute of Technology, Kolkata
• Patel College of Science and Technology, Indore
• Shaheed Bhagat Singh State Technical Campus, Ferozpur

Etc.

Moreover you can predict your own college by yourself through Careers360 College Predictor tool(link mentioned below);

https://engineering. careers360.com/jee-main- college-predictor?icn=QnA&ici= qna_answer

Good Luck.