Hi Rajesh,

CBSE syllabus is important to be read in each and every class.

But if you are a student that works hard only in important classes than it's 9th from which you should start studying according to the syllabus provided by the respective board.

Syllabus is very important to prepare according to the exam pattern.

So, do take that seriously.

Feel free to ask doubts in the Comment Section.

I hope this information helps you.

Good Luck!