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Yes, you can pursue law after 12th,
The basic eligibility criteria for pursuing a B.A. L.L.B. integrated degree is qualifying 10+2 or equivalent examination with at least 50% marks in the aggregate.
Also, there are several state level entrance exams conducted for admission into B.A. L.L.B. integrated degree course. Some prestigious institutes like National Law School in Bangalore conduct separate entrance test such as All India Entrance Examination for admission to the degree courses. The entrance examination is objective type in nature. The questions invariably cover areas like legal reasoning, logical reasoning, Maths, English, general awareness, numerical aptitude, legal aptitude and preliminary Political Science.

There are many colleges offering regular degree course as well as in correspondence. Some are recognized and some are not. If you do the degree course from a recognized board or university then the value is similar for both the exams. Actually the correspondence course was introduced for the benefit of students who were unable to attend regular classes due to certain unavoidable circumstances. So you see that the main difference is that in regular classes a student gets to learn from distinguished professionals in the class room whereas in correspondence a student prepares himself with some assistance from tutors. Regarding its acceptance and value both holds equal relevance provided the degree is obtained from recognised universities or boards.