i want to do engineering in computer science or electronics and communication but I've got a rank of 38512 in jee mains 2017 and couldn't do any good in jee advanced. i want a decent college preferably govt. So what colleges can i get admission in with this rank? i did my 12th last year 93.25% in ISC board and couldn't even qualify jee mains last year so prepared for one year without taking admission in any college.

okay, Abhinav. Just let me tell you one point clearly. past is past. And if you really interested in engineering, you can get into any private college and if you really want government colleges there are less chances and I suggest you to ho through this link once.
www.careers360.com/college-predictor
you'll definitely find good one.
All the best.