Surely undergoing training will help you in fulfilling your aspirations. Aakash Institute is quite popular in this stream. But just going for coaching is not sufficient. You must be thorough in every area that is being taught for the day. Never postpone by a day. Also if you are not clear in any area you must clear it immediately. Brilliants is also a popular institute in this field. They provide correspondence material.
If we evaluate the performance of Aakash result will be such that - Best of Medical Entrance Preparation, Better for WBJEE(West Bengal Joint Entrance Exam)& AIEEE and Good for IITJEE.
So, why only opt for Good one, when Best are already there.