Hii

To get addmission into BA LLB course, it is compulsory  to appear an entrance exam and qualify the cutoffs. 
No college offers admission without entrance. And also different colleges accept scores of different entrance exams. So if you specify which college are you wishing to apply, i could help you better.
The most common entrance for Law courses is CLAT exam. With CLAT score, you can get admission into any of the 21 NLUs which offer courses like BA LLB, BBA LLB And simply LLB Also.
Eligibility for CLAT- 

• Candidates should have passed 10+2 board examination from any recognised educational institution. 
• Candidates belonging to the General category need to score at least 45 per cent marks in their qualifying degree. Those belonging to SC and ST categories, need to score at least 40 per cent marks in the aggregate of the subjects.
• Further, there is no age bar to appear in the Common Law Admission Test.

The application process for CLAT has started and will continue till 31st March.
The exam will be conducted on May 12th 2019.
For more details refer to following link - https://law.careers360.com/exams/clat

Other than CLAT there are many more entrances for LAW
Here is a link which u can use to know about different entrance exams for LAW.
https://law.careers360.com/exams

Hope this helps, feel free to revert back incase of any more doubt.
Thanks!!