A minimum of 81/360 marks from JEE main is must to get through JEE advanced exams for all IITs.

For all other categories the minimum qualification marks are well below 50/360.

JEE Advanced has following other criterias as well which have to be followed:

https://engineering.careers360.com/articles/jee-advanced-eligibility-criteria

To get to know about

JEE advanced shoul be strictly online from 2018 as per official notification and hence, it is impertaive to join Online test series by ALLENKOTA or RESONANCE.

Both the test series shall help you ease the pressure and with attempt to more than 10-15 mock exams you shall be completely confident,

You cannot judge the total marks based upon which books you have covered, although you can get fair idea by giving ample of mock exams by joining tests series by AllenKota, Pace or Resonance, which have set of 20 test exams with JEE Advanced paper pattern.

This will help you

You cannot judge the total marks based upon which books you have covered, although you can get fair idea by giving ample of mock exams by joining tests series by AllenKota or Resonance, which have set of 20 test exams with JEE Advanced paper pattern.

This will help you take

There are number of books available in the market for Organic chemistry but the best out of the alot is by OPTandon. The book has following advantages:

• the book has alignemnet with latest paper pattern for JEE Advanced 2017
• Questions are modelled according to previous year papers so students get

JEE advanced is strictly in online mode and hence, in our opinion one must solve previous year papers via online mode to get a good feel and be comfortable with this process.

Hence, past papers with solution sets have been shared for downloading below:

http://www.iitbooks.co.in/2017/04/JEE-Advance-Previous-Year-Solved-Papers-PDF.html

Alternatively you can purchase book

Both the books are very good, Hoever Arihant NCERT books are more recommended as they contain relevant problems and saves time and is more appealing to majority of JEE aspirants.

This book has compaartively systematic approach and gives a good flow of topics such that preparationn goes smooth enough.

You

If you are not consider as PwD category then you will consider as only OBC candidate but you have to show your proper certificates for OBC category.

Good luck!!

There is vast syllabus for  physics and weightages have been dsitributed for JEE mains and advanced as per previous year papers:

For JEE mains the most important chapters are as:

• rotational motion - 6.33%
• units and dimensions -5.33%
• waves - 5.01%
• thermodynamics - 6.33%
• moving charges and magnetism - 6.33%

As the session is already over but generally the board has not announced top 20 percentile for the year 2017 but last year they had mentioned it so you can consider that only as there will be no such big changes and difference.

Hope this helps!!!