There is no common entrance exam for LLB programme, If you want to know about AILET then the exam is conducted for five-year integrated law programme and LLM (Postgraduate) programmes only. Generally the universities for LLB programme require minimum 50% in Graduation but as you told that you have less than 50% in your Graduation then you can go for Symbiosis Law Pune, To get admission there you should have minimum 45% marks (40% for S.C. /S.T.) in one attempt (No Compartment). You can check the complete detail with the given below link.

https://www.symlaw.ac.in/threeyears-llb-admissionprocess

Good Luck!