Hello!!!

Hope you are doing great!!!
The important exam for  joining B.Tech is JEE Mains & JEE Advanced.These both exams are National wide examinations.Firstly,the candidates have to clear the Jee mains.After that,the candidate can write Jee Advanced.Through Jee mains,the candidate can join in NIT's if he/she is qualified according to the respective cutoff's by the colleges.After qualifying in the JEE Advanced,he/she can join in the IIT's if the candidate is qualified according to the cutoff's by the respective colleges.The syllabus for both the exams is intermediate syllabus.

For more information,Kindly go through the links provided below:

https://engineering.careers360.com/exams/jee-main https://engineering.careers360.com/exams/jee-advanced

Hope it helps you !!!

Good luck!!!