Hello aspirant,
BA LLB isa five-year course. Having passed 10+2 or equivalent exam from a recognized board with a recommended minimum of 50% on aggregate, a candidate may apply for this course. Admission to most of the law schools/universities is done through a national level or university level entrance test.
The top colleges offering BA LLB are:

Symbiosis Law School, Pune

Indian Law Society Law College, Pune

Sighad Law College, Pune

National Law University, Delhi

Faculty of Law, Osmania University

Faculty of Law, University of Calcutta

top entrance exams for BA LLB are:

AILET: Said to be conducted in January 2019, this exam is a national level exam and its scores are largely accepted everywhere. The questions in this test are asked from Current Affairs, English, Reasoning, Mathematics and Legal Aptitude.

CLAT: Conducted on a rotational basis by 19 NLUs in May, this exam is meant for admission in law course. The syllabus for this test encompasses Current Affairs, English, Reasoning, Mathematics and Legal Aptitude.

LSAT: This paper pencil bases entrance test is conducted by LSAC for admission in various law programs across the country. Nearly 76 colleges accept LSAT score for admissionto BA LLB course. The syllabus for this test encompasses Analytic reasoning, logical reasoning and reading comprehension.

Following are the subjects from which the questions are asked in all the entrance tests-

Reasoning

Legal Aptitude

General Knowledge/Current Affairs

Mathematics

English

All the best.