I want become a lawyer so I don't know what can I do after 12th
If you wish to become a Lawyer, then you have two ways to go. The first way is a time saver in which you can join the course of Integrated LLB such as BA LLB, BBA LLB, BSc LLB, BCOM LLB etc. This are the 5 years course in which you will be provided two degrees after the 5 years course. This courses are UGC approved and after completion of this courses, you can practice law. The admission are usually provided to this courses on the basis of CLAT examination.
The 2nd way is that, you take admission in any of the UG degree courses and after the completion of your UG course, you can take admission in the LLB course. This way have only one demerit that you will need more time. For examination, if you do a BA course, then it will take 3 years and the LLB course will be a 3 years course again. So in total you will be required 6 years of time. Now its your choice which you want to choose. Both the courses are great except the time frame limits.
For more information regarding CLAT examination consider the link below:
https://law.careers360.com/exams/clat
For more information regarding LLB consider the link below:
https://www.careers360.com/courses/llb-bachelor-of-legislative-law
I hope this helps. Wish you a great day!