No, your B.A. Geography and current M.A. in Geography likely wouldn't make you eligible for the IIT JAM Geology or BHU M.Sc. Geology entrance exam.

IIT JAM typically requires a Bachelor's degree in a relevant science field like Geology, Geophysics, Physics, Chemistry, Mathematics, or Environmental Sciences. While Geography might touch on some related topics, it wouldn't be considered a direct equivalent for the Geology program. Similar to IIT JAM, BHU M.Sc. Geology entrance exams often require a Bachelor's degree in Geology, Geophysics, or other allied earth science subjects.

https://university.careers360.com/articles/how-prepare-jam-geology

I hope it helps!