Hello Nishita !!

Common Law Admission Test(CLAT) conducted by 21 NLUs in India ,It's an all india entrance exam to get admission in law schools/universities for undergraduate and post graduate programmes (LL.B&LL.M).Eligibility criteria for undergraduate is a candidate should secure minimum 45% for Obc and for sc/st 40% in 10+2 ,candidates who are appearing for the board examinations in march/april can also eligible to appear for clat 2020 .I can provide the links of important dates ,notifications ,exam pattern of clat and for more information just go through the links provided below:
https://law.careers360.com/exams/clat

https://law.careers360.com/articles/clat-exam-pattern

https://law.careers360.com/articles/clat-application-form

Hope that helped you!!

Good luck!!