Exam

Hi,
1) Institute of Management Studies, Devi Ahilaya University
2) IPS Academy
3) Sangavi Institute
are good Institutes to accept ATMA scores.

Your state or city/ town in which you are looking fro admission matters. Your Category also matters in getting a college. You can get CSE branch. Do your research about the colleges in your city/town. See there last year's cut-offs.
Good luck.

RV College Of Engineering, Ramaiah Institute Of Technology, BMS College Of Engineering, The National Institute of Engineering-Mysore, PES University-Bangalore, Dayanand Sagar College of engineering are the top colleges for mechanical engineering that you can get through KCET.

If you are sure that you can do better next year or you can get some good college or a better rank in JEE, then you have to wait for it, otherwise don't waste your time and money.

Sorry to say but it is difficult to get admission in NITs for you.
Chances are very less. Apply for JOSSA and perhaps, you can get an admission by luck.

If you don't have a good rank in JEE, you have to try for some other CET entrance like MHCET, but the time is over as you have to wait for next year or try some another colleges through any other options like management quota.