Physics & Maths tutor, JEE Main and Advanced Expert, IIT Delhi Student, Olympiad Specialist
Having purchased the IIT JEE advanced study material and mock test series is a good step. I would now suggest that you start reading the chapters in the NCERT Text book sequentially, then read the IIT JEE Advanced study material, solve as many questions as you can. Once you are confident on some topics, and feel you can go for it, solve the mock test. Prepare well for it first though.
You have the material from which you can study; what you need is a strategy. You must read all the topics of all the subjects (with a proper schedule and targets) thoroughly, understand all the fundamental theorems and principles, and solve the questions based on that. You should give as many mock tests as you can, for practicing and for self-evaluation If you have difficulties and doubts, ask for help; you could go to your friends. If still in trouble, you can always reach us. We, here at Spanedea, take tuitions online to help students on all the topics, making sure a clearing understanding to them.