In the test session, I can see many questions which are not explained in the chapter. In the study material, only an overview is given, not the way to solve complicated questions. So, please add some topics explaining the way to solve difficult questions.(especially in Physics)
We have added your suggestion into our to-do list. We will try to work on it and incorporate it in the text. Keep posting your feedbacks and suggestions. They are immensely valuable for us.