Dear candidate, eligibility criteria for different branches and different caste is different:

• There is no age limit for IIT JAM.
• Candidates meet IIT JAM eligibility criteria 2021 if they possess a bachelor’s degree with minimum 55% aggregate marks or 5.5 CGPA/CPI out of 10 if they belong to general/OBC (NCL)/EWS category. For SC/ ST/ PwD category candidates, the eligibility criteria for the exam is such that they should have secured 50% aggregate marks or 5.0 CGPA/CPI out of 10. Aspirants who have given their graduation exam or are set to appear for their final year exams in 2021 also meet IIT JAM eligibility criteria. For candidates who have been given letter grades/ CGPA as a substitute for percentage of marks, the equivalence in percentage of marks will be decided by the admitting college/ institute.
• For eligibility criteria of different branches, you can visit the given link:

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

Hope, it helps!