Hello,

Important question from chapters will be it's basic concept. like what is this? and why is this?. when you cover any concept ask it to yourself and answer genuinely like you are teaching yourself.

on important part, cover the tips given, examples and exercise given in the middle or end of the chapter. Read summary and remember it. There are bold words in pages. do  cover them.

Important is like what will surely come in exam, but no one knows what will come in the question paper so no one can say but you can learn how to cover full syllabus in time.

Hope it helps!