I've got 89.8% in 12th but 29 marks in JEE Mains. Are there some private colleges which give admission based on 12th marks?

There are a lot of private engineering colleges that provide admission on the basis of 12th board results. You can consider applying for the following colleges:

1. Amity University

2. SSN College of Engineering

3. SKCET

4. Chitkara university, Chandigarh

5. Satyabama Institute of Science and Technology

Yes, a lot of private universities accept applicants based only on their grade 12 results. With 89.8%, you could think about:

1. Manipal Academy of Higher Education (MAHE)
2. Vellore Institute of Technology (VIT)
3. SRM Institute of Science and Technology
4. Amity University
5. Lovely Professional Univer