Hey Sheetal.

Yes, you are eligible to take the CLAT examination as there is no upper limit for this exam as of now. You just need more than 45% marks in your 12th board result to be eligible to take the exam. CLAT is for admission in 5 year LAw courses which combine Undergraduation courses with law like BA+LLB, Bcom+LLb etc. You have another option too that as you're already in the second year of your Undergraduation you can complete it and in your final year attempt entrance examinations for 3 year LLB colleges  like Delhi University, MHCET, SLAT , PU LLB etc.

You can usethe link below to  know the difference between the two.

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

Best of luck!

Best of luck