Hi dear,

Hope you are doing well!

Now let's go through your question.

As you will be knowing that JAM which is conducted annually by different IIT’s. And candidates who clear the IIT JAM  Cutoff will be granted admissions on the institutes of their choice through the JAM counselling procedure.

Basically, cut off for IIT JAM is decided on the basis of the difficulty level of exam, number of vacancies available, total number of student appeared, previous year IIT JAM cut off and average marks obtained by candidates in IIT JAM.

• In Physics, qualifying marks for general category are 19.51 while for SC/ ST/ PWD, it is 9.76. For Physics Paper, 11902 candidates appeared for the exam.
• In Chemsitry, qualifying marks for General Category students are 14.79 and 7.39 for SC/ST/PWD. For Chemistry Paper of IIT JAM 2018, 11512 candidates appeared.
• In Mathematics, qualifying marks for General Category are 23.35 and 11.68 for SC/ST/PWD.

For knowing JAM Cutoffs year wise not only for mathematics but also for other subjects I would recommend you to visit this link:

https://university.careers360.com/articles/jam-cutoff

(Just copy and paste the link in a new tab)

Thank You & All the best!