Hello Ravi, 

Hope you are doing great.

The IIT JEE exam is conducted to select the candidates for the admission into the top institutes of India for the engineering courses. 

The JEE exam is conducted in two phases that are JEE mains and JEE advanced. 

Both the exams consist the three subjects that are mathematics, physics, and chemistry. 

After the JEE mains exam, top 224000 candidates will be selected for the JEE Advanced exam. and the candidate needs to secure more than cut off marks to get a seat in IIT institutes.

The JEE Mains cleared candidates also eligible for admission into NITs and other top institutes. 

IIT JEE is one of the sought after examination to get admission into IIT for engineering aspirants.

So if you want to get into IITs, start to prepare for the exam.

All the best for the IIT JEE 2018 exam.