Yes, you can give CLAT exam after 12th standard. It is also a wise decision to check out CLAT eligibility.However, the other prerequisites areThe candidate should qualify 12th board examination of 10+2 educational systemThe candidate should have scored at least 45% makes in the aggregate of subjects studied in 10+2 grades. (This varies depending on the category the student falls into)The upper limit for a candidate to appear for CLAT is 20 years and 22 years for reserved categories..