Hey,

To become a psychologist you should do any of the psychology courses after 12th, such as BA, BA(hons.), BSc. Or BSc(hons.). After that pursue your specialisation by doing the relevant master's degree. You can further specialise by doing a PhD or Masters.

For more detailed information - https://www.careers360.com/courses/articles/psychology-courses-after-12th-counar

HOPE THIS HELPS YOU.