Hey!

No, you can not attempt IIT-JAM after your 12th class.

Since IIT-JAM exam is conducted by the government for admission to Master's degree, So to attempt IIT-JAM, it is compulsory to have a Bachelor's degree.

You can try it after the completion of your graduation.

Hope this answer helps!

As per the eligibility criterion a Bachelors degree is must to appear for IIT-JAM. Also candidate belongs to Genera /OBC category should score at least 55% in graduation and for SC/ST/PwD it is 50%.

The full eligibility criterion can be found by visiting the link

https://university.careers360.com/articles/jam-eligibility-criteria

HELLO NIKITA
the answer is no Since the eligibility criteria is different for this exam It is a post graduate level exam
The courses offered by the JAM exam are as follows
M.Sc. (Two Years), Joint M.Sc.-Ph.D., M.Sc.-Ph.D. Dual Degree, Post-UG Degrees Programmes at the IITs and Integrated PhD Degree Programmes at IISc
as you can see all of this are master degrees so this is the reason you cannot give the exam
https://university.careers360.com/articles/jam