Hey Shivam !

It's very much appreciated if you can make the notes right from the beginning of your preparation just as the course progresses. These notes always come handy just before your exams as they contain all the formulas of Physics and Chemistry at one place which saves your time to turn pages. Then you can write down the important examples in the subject of Biology to help you remember them. Important name reactions in Chemistry and the laws of Physics. Each and every detail turn out to be vital for exams. 

Hope this helps.

All the Best.