As you asking I am telling about IIT JEE New Pattern

JEE Mains (Paper 1) :

As the pattern is known beforehand and is nearly same every year which is as follows-

Physics : 30 Questions

Chemistry : 30 Questions

Maths : 30 Questions

Marking Scheme:
Each question is awarded 4 marks for correct response, for incorrect response 1/4 th of marks will be deducted (here 1/4th is 1 so -1) and for no response no marks will be given.

JEE Advanced :
There are two question papers: Paper 1 and Paper 2 of three hours duration each. Both papers are compulsory. Each question paper will consist of three separate sections, viz., Physics, Chemistry and Mathematics. The question papers will consist of objective type (multiple choice and numerical answer type) questions designed to test comprehension, reasoning and analytical ability of candidates. Negative marks will be awarded for incorrect answers to some of the questions.

Number of papers: 2
Duration of exam: 3 hours per paper.
Sections in each paper: Physics, Chemistry, Mathematics.

Key dates
IIT JEE 2016 Registration 29 Apr 2016
Last date to apply 04 May 2016
Availability of admit card 11 May 2016
Date of JEE Advanced Exam Paper 1 – 22 May 2016, 09:00 AM to 12:00 Noon
Paper 2 – 22 May 2016, 02:00 PM to 05:00 PM
Display of ORS and scanned images 01 Jun – 04 Jun 2016
Publishing of answer keys 05 Jun 2016
Feedback and comment on answer keys from candidates 05 Jun – 07 Jun 2016
IIT JEE 2016 Result 12 Jun 2016
Online registration for Architecture Aptitude Test 12 Jun – 13 Jun 2016
Architecture Aptitude Test 15 Jun 2016
Declaration of results of Architecture Aptitude Test 19 Jun 2016
Seat Allotment 20 Jun – 19 Jul 2016