**Some topics you will study,
preparing notes for the topics you have studied,
solve practice questions or numericals related to the topics, and
solve at least two practice papers, sample papers, mock tests, or IIT JEE past year papers a day.
It used to take me 5-7 hours to complete my daily goals. Use your clock only to see how much time you took to solve the tests.
=> First u have already joined a coaching,its good you would always be in right direction in your preparation.
Now about your query of dummy school. If your sole aim is to crack jee advanced you may join dummy school.
But, I am not forcing my decision . seeing the current scenario 12board marks are getting more an more important.
Hence I would suggest you to decide for yourself what's good for you.
So, my suggestion would be this: go out, buy some authentic books for IIT JEE. And start reading, try to understand on your own.
Then solve problems at the end of each chapter, try to apply those principles in those problems. Then read the chapter again.
If you get stuck, don't worry. Keep thinking, it will come to you. And within days, those would occupy your head.
Then you won't need to push yourself. You would be driven by the desire and passion to learn more about it.
if further you have any doubt then ask on sarthaks econnect .........Good Luck.