If you are in school and want to pursue a career in law, then you can consider appearing for CLAT. Except for NLU Delhi, all other NLUs consider CLAT scores for admission. At NLUs you will learn to be a good legal professional. 

If you are a law graduate you can appear for CLAT, if you want to study LLM at NLUs. You can also apply for a few certain govt. Vacancies in the legal sector through CLAT.