The admission process for every institute may differ accordingly. Some Institutes take direct admissions and some of them assess your skills and knowledge through entrance test. 

Some best colleges for the course are:

Gujarat Forensic Sciences University ,

Dr . Bhim Rao Ambedkar University Agra,

Lovely Professional University Punjab,

Lok Nayak Jayaprakash Narayan National Institute of Criminology & Forensic Science,

Bundelkhand University

Osmania University, Hyderabad

University of Madras ,

Dr. Hari Singh Gour University ,

IFS Mumbai

IFS Aurangabad

IFS Nagpur

IFSs are the best of them all. You can apply for admissions directly by visiting the college website.

Hope it helps.

Best of luck!