Btech colleges which provide admission on the basis of your 12th marks are:

1. Shreemati Nathibai Damodar Thackersey University - Mumbai, Maharashtra
2. Bengal Engineering And Science University - Howra, West Bengal
3. Jabalpur Engineering College - Jabalpur, Madhya Pradesh
4. Saveetha University - Chennai, Tamil Nadu
5. Coimbatore Institute of Technology - Coimbatore, Tamil Nadu
6. Merit International Institute Of Business Management - ooty, Tamil Nadu
7. College of Engineering - Ahmednagar, Maharashtra
8. Amrutvahini College Of Engineering - Ahmednagar, Maharashtra
9. Amity University

You can try reaching them from their official websites.