There is only two method to take admission in BSc Psychology .
1. Merit based
For merit- based apply for Delhi University and other colleges who take admission through merit based.
The admission in the elusive University of Delhi is based on the merit list produced by the university. The University releases the cut off list, and if you are eligible, you can get in touch with the college and secure your seat.
For entrance-based apply for entrance and crack that exam. And you are in.
All the best!