Hi Aspirant! For getting admission in NIT colleges, you need to atleast clear JEE MAIN exams which is conducted in a year. Also, 75% should be scored in your 12th standard. So, now you can start your JEE MAIN preparation by collecting samples, practising it, download previous questions from their official website- https://jeemain.nta.nic.in/webinfo/public/home.aspx which will help you crack it easily and get into NITs or IITs. Consider NIRF ranking too which will let you know the colleges rankings in India. All the best!!                                                                              Hope this article will be helpful- https://www.google.com/amp/s/engineering.careers360.com/articles/how-get-admission-in-nits-through-jee-main/amp