If you want to take some coaching then before that you must visit this site atleast once. It gives first chapter for free so you can check it out whether is it worthy to buy or not.
I liked this site a lot. I bought the courses of 9th , 10th . It enhanced my interest in studies and I was always one step ahead of others as I usually study in advance so that I could easily understand whatever teacher is teaching in the class.
So I would recommend this site.