Hey lakshyaa,

Other than Du colleges you can go for

Jawahar Nehru University, Delhi

Jamia Milia Islamia University

for bsc in psychology. They are among the best institutes in delhi that offer that course. Admission to these colleges are based on the entrance exam conducted by the Universities itself. You may check the website of these colleges in order to get a better idea.

You can also check I.G.N.O.U. as it's among the top ranking college for bsc psychology. 

Hope this helps! 

Good luck!