If you are willing to join Nex-G, please look into some facts before joining it. One of my friends was learning at this institute, he told me that CEO of this company present all fake things. Would commit to complete course in 3 months but would take a year to complete. He would say that he have offices outside India and having some ongoing projects, just ask the person that who are your clients for whom you are doing the development since this is an old company they should have some valuable clients to show-off.
Would he allow you to contact with the trainer before charging the fees? the answer is no. Since the trainers are not worth you are paying for.