You can follow R D Sharma or R S Agarwal to start with for your school exams.
If you want to take on difficult maths for IIT, then you can use M L khanna or you can also purchase Vidya Mandir correspondence course.
It will be good if you complete books for both school and IIT.
You will have to study for at least 5 hrs a day to get good command in maths. But u can do it on alternate day basis rather than doing it daily because u have other subjects too to study. Practice questions by hand is must. Just reading methods to solve the questions is not enough.
Please feel free to ask as many questions you have.