There are many students in India who are preparing for JEE Mains without coaching, I personally know a lot of my friends getting into IIT only by self study. It totally depends on your dedication that whether you will mentain the discipline throughout the 2 years or 1 year. The thing which really matters a lot in the preparation of Jee is whether your basics are strong or not, lastly you need a teacher for clearing your doubts. So, if there is someone who is your teacher and who can solve your all doubts then there is no need for a coaching center just maintain the pace throughout the preparation period.

Best of luck.

There is always a way, if there is a strong will .