See there are a mixed set of reactions available for the institutes you have mentioned.

As per the reviews available, online, GATEIIT is the best institute for the IIT JAM Economics as it has a better structure of the course. The notes are very well composed and have minimal errors. Also, the test series is mostly the best for the Economics. So you can go for the GATE IIT to taking coaching for the IIT JAM examination.

To know more about IIT JAM 2022, visit the link below:

https://university.careers360.com/exams/jam

To know more about Economics, visit the link below:

https://www.careers360.com/courses/economics-course

I hope this answer helps. All the very best for your future endeavors!