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If you want to pursue LLB and LLM then CLAT is a single unified entrance test for candidates who want to pursue 3 year LLB, 5 year Integrated LLB and LLM. The entrance examination is conducted annually for UG and PG programmes.
CLAT ELIGIBILITY FOR UG
candidates should have 45% score in their 10+2 with a recognised board.For candidates belong to SC/ST Category there is a minimum need of 40% .

CLAT ELIGIBILITY FOR PG
Candidates should have scored a minimum percentage in qualifying examination (i.e. LL.B./ 5-Year Integrated LL.B. (Hons.)/ any other equivalent exam) for CLAT LLM. The marks vary according to the category of the candidates.
Candidates belonging from Unreserved /OBC /Specially Abled Persons (SAP) and other categories: a minimum of 50% marks are required.
For SC/ ST category – a minimum of 45% marks is required.
On the date of admission, candidates should have passed or appeared in the final semester/final year examination of the qualifying examination.
Candidates need to submit the final result of the qualifying examination within the time alloted by the respective University/Institute. Till then those  candidates are supposed to be given provisional admission.

You can visit for more detailed information

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

If you want to download sample papers visit the below given link

https://law.careers360.com/articles/clat-sample-papers