Hello,

You can pursue a B.A. or B.Sc. Psychology courses are offered by several universities in South India without having a background in psychology from the 12th board.

With any stream, a minimum obtained mark that is 50% of the total marks in the 12th board is the minimum eligibility for these courses.

https://www.careers360.com/courses/psychology-course

This link consists of top university lists, eligibility, and fee structure.  Everything you need for the course reference is enclosed here.

Hope it helps with your query. Good luck.