There are many good institutes in Chennai that offer Law studies. Since you have not mentioned a preperence of institute type, i.e. government or private, I'll just list down a few colleges for you. Government colleges usually have entrance exams whereas admissions to private colleges are based either on entrance exam or on your class 12th or graduation result. Following are some good colleges:
Department of Legal Studies, University of Madras
Dr. Ambedkar Government Law College
School of Criminology, Tamil Nadu Open University
Sky Academy, Palapakkam
Sriram Law Academy
For more Law colleges in Chennai check the following link: UG LLB colleges in Chennai
in Rajasthan it's Vivekananda Global University Jaipur