Hello aspirant!

IIT JAM cutoff tells about the minimum marks required to qualify the examination but doesn't guarantee admission in any particular institute. The cutoff depends on many factors like difficulty level of question paper, number of applicants, etc. Now, previous few years cutoff trends for your category ie OBC-NCL are as follows:-

Year          2017        2018          2019

Cutoff       21.02       25.61        18.28

Now, the cutoff varies every year due to changes in number of applicants and difficulty level of paper so it is very difficult to predict the marks or rank required to qualify IITJAM, however, these previous year trends may help us in getting some knowledge about cutoffs. So, a score of 25+ could be good enough to clear the cutoff.

Now, referring to your query about IIT BOMBAY and IIT HYDERABAD. Firstly, IITB, the previous year opening and closing ranks for OBCNCL category is as follows:-

ROUND 1:- 104

ROUND 2:- 104

ROUND 3:- 111

It is very difficult to predict the marks required to get these ranks, however, using marks vs rank considerations , a score of 50+ in Chemistry would give a rank in between 0-100, so you should aim for score close to 50 for IIT BOMBAY for your category.

Now, for IIT HYDERABAD, the previous year opening and closing ranks for OBC NCL are as follows:-

ROUND 1:- 513

ROUND 2:- 513

ROUND 3:- 627

Similarly, predicting the marks required for this rank is very tough but using marks vs rank considerations, a score between 35-40 could give you a rank close to 500.

Hope this helps you.