What are the courses available in all iit's and nit's?

Courses differs from College to college  but u will be sure of some courses to be present like B.Tech in Civil , ECE/Electrical/EEE, Mechanical, Computer science . These are the common Engineering courses that every college including IITs and NITs provide  But apart from these , Metallurgy and Materials Engineering, Production , Biotech is also there in some institutions

IITs and NITs also provide the same courses but some of them have additional courses too like Mining Engineering, Aerospace Engineering , Mathematics and Computing etc.

So courses will differ from college to college.

Thanks.