In jee everyone should write 2exams???means if we taken main only then we should attend first advance then main exam
UPDATE: B.Tech applications open at Manipal Institute of Technology Apply Now
If you want to take admission in NITs/IIITs and GFTIs you have to appear for JEE Main paper 1 exam for B.Tech course.
For IITs you have to appear in JEE Advanced exam. To be eligible for JEE Advanced you have to qualify JEE Main exam first.