does coaching has any role in jee preparation or every coaching is same ?

Hi Sanjay,
To join a coaching class or not is totally your choice. A Coaching class can act as a guide but the selection mostly depends on your efforts. A good coaching class provides you with proper guidance, assignments and tricks to solve complex questions in meantime. Various test series also help students to prepare well. But it doesn't means that it is always necessary to join coaching class. If you already have proper knowledge about syllabus and proper guidance regarding the pattern of question paper and type of questions that will be asked, you can easily prepare at home.
All the best!