Hello Dear

LEET exam is conducted for Diploma holders who want to get admission in B.E or B.tech courses. This is national level exam. But you can also apply for state level exam. You are not eligible to take admission in NIT but you are eligible for IIT. Diploma holders are eligible to get direct admission in second year of B. Tech or B.E. For more information you can visit the link below:

https://engineering.careers360.com/articles/how-get-admission-in-iits-after-diploma

Good Luck