Hi Rajeswarinandigam,

Thanks for asking, passing 12th is the basic qualification to pursue law in India. Whether it is 3 years law or 5 years law. According to the BCI, It is mandatory to qualify basic education. You can see the eligibility criteria for law on this link.

http://www.barcouncilofindia.org/educational-criteria-educational-qualification-required-for-admission-into-3-year-and-5-year-law-courses-in-india/

Good Luck!