As I am also an Akashian so I feel that Akash modules and E-caps have few questions that's why I also referred to Reasonance material.

Aakash institute comes in one of the top coaching institutes.

Aakash study material is enough to crack IIT JEE exam. It's totally depends on you which study material you want to follow.

To score good marks in JEE Advanced it is very important that you basics are clear. To clear your concepts and to build your fundamentals strong you can take help of NCERT books.

You should always refer a study material in which you are comfortable. Don't run after so many books. complete one book then you can move to another.

Make sure you refer to previous year papers and mock test series for your practice.

All the best for your preparation!!