Hey,
Generally, students start preparing for IIT Jam from their undergraduation as the syllabus of JAM is whatever you study in your undergraduation. You may enroll in a coaching institution or simply solve the mock test paper at home.
Yoy can follow the link given below to understand the preparation startegy for JAM in a detailed manner:
https://university.careers360.com/articles/how-prepare-for-jam
Hope this helps.
Good luck.

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