As you asking here I am telling to get into IIT Chennai B.tech program you have to appear in JEE Advanced exam which is the popular examination conducted by the seven zonal Indian Institute of Technology (IITs) under the guidance of Joint Admission Board (JAB).

Key dates
JEE Main 2017 (Offline Exam) 2nd April 2017
Jee Main 2017 Result Declaration 27th April 2017
JEE Advanced 2017 Registration date 28th April 2017
JEE Advanced 2017 Registration close 2nd May, 2017
Registration with late fee 02-05-2017, after 17:00 IST to
04-05-2017, 17:00 IST
Admit Card Downloading Starts from 10th – 21st May, 2017
JEE Advanced (Paper-1 and Paper-2) 21st May, 2017 (9 – 12 PM & 2 – 5 PM)
Online display of ORS and scanned responses 31st May to 3rd June 2017
Display of Answer Keys 4th June, 2017
Collecting candidate’s feedback on answer keys 4th – 6th June, 2017
Result Declared on 11th June, 2017
Date for the online registration of Architecture Aptitude Test (AAT) 11th – 12th June, 2017
Exam date for Architecture Aptitude Test 14th June, 2017
AAT Result Announcement Date 18th June, 2017
JEE advanced Counselling starts 15th June, 2017
Special round counselling 27th July 2017

Fee:

The details about the registration fee is given below, The late fee for Indian was 500/- Rs. and for foreigners, it was USD 80.
Examination Centres in India
Female Candidates Rs 1200/-
SC/ST/PwD Candidates Rs 1200/-
All Other Candidates Rs 2400/-
Examination Centre Outside India
All Candidates USD 135 (For SAARC Countries)
All Candidates USD 270 (For Non-SAARC Countries)

Eligibility Criteria
Students appearing for JEE Advanced 2017 have to score minimum 75% marks (for Gen/OBC) & 65% marks (SC/ST/PwD) in 12th or equivalent class. OR

Must be within the category-wise top 20 percentile of successful Students in their respective Class XII (or equivalent) board examination.

Students should be among the top 2,20,000 (including all categories) by scoring positive marks in Paper-1 of JEE (Main) 2017.

Exam Pattern

Papers: JEE Advanced examination comprises of two papers: Paper 1 and Paper 2.
Attempt: Candidates have to attempt both the papers.
Duration: The duration of both exams was three hours.
Question Type: The question paper was consist of objective type (multiple choice and numerical answer type) questions.
Mode of Language: The medium of the question paper was Hindi or English.
Subjects: Both question paper was contain the three separate sections i.e., Mathematics, Physics & Chemistry.