Hello,
No,It is not compulsory at all to have mathematics as an essential subject in your class 12th board exams for IITJAM examination.There is no such eligibility criteria for IITJAM exam or for admission in any of the IITs.So don't worry about this.
For details visit the below given link:
https://university.careers360.com/articles/jam
Good luck.

IIT Indore

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