Hey Manisha.

The forms for different entrance examinations are required to be submitted at different times. Some law entrances release applications in the month of December- January and some till march. You can use the link below to check the entrances. Admissions in most if them is through separate entrances hence your rank in them will be considered insteaf of 12th percentage for admission. You'd require atleast more than 50% marks to be eligible to take the entrances. This also varies with each entrance.

https://www.google.co.in/amp/s/law.careers360.com/articles/9564-law-entrance-tests/amp