Hai irfan shaikh,
There's no diploma course available in law.
If you really want to be a lawyer professionally, After 12th , you go for 5year integrated LLB.
For more details,check this link:
https://www.careers360.com/news/9564-law-entrance-tests
Some university offers diploma course in PG level. For this you must complete UG degree in any recognised board.
For reference :
http://tndalu.ac.in/distance_education_department.php
Hope it's useful for you!
Thank you
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