The 2015 Student Enrolment Form has relevant details (including FEE info), which you must read carefully. The main points are mentioned below.
Two year course for IIT JEE 2017 (duration from Jun 2015 to May 2017). Last date for admission is Aug 10, 2015.
You must have passed Class X board exam with a minimum of 50% in English and 70% in Maths and Science. If Class X board results are not available, then use Class X pre-board AND Class IX final results.