Hello Neeta,

Different states and group of colleges have different entrance exams for seat allotment to the students and one of the main examination is CLAT that is Common Law Admission Test. 

It allocates law seats to candidates aspiring seats in National Law Universities. 

You can check the details here. 

https://law.careers360.com/articles/clat-eligibility-criteria

And you did not mention any exam or college so it was quite difficult but try posting a new query with complete information and we will be Happy to help you.