As a PCM student in 12th, you can still pursue Psychology through CUET, as your stream does not limit eligibility. For admission in B.A./B.Sc. Psychology, you need to attempt the Language test (English/Hindi) , the General Test (reasoning, GK, aptitude, current affairs) , and one Domain Subject , preferably Psychology if offered, or Biology/Sociology/Political Science , depending on the university’s criteria. So, prepare mainly for English, General Test, and a relevant domain subject to qualify for Psychology.