hi aspirant!
Hope you are doing good.
you are in class 9 th and focus on your three subject which are Science,Mathematics,English.

in the Science subject of class 10 the 50 % of part are related to the 9th standard and also the all the basic of the 10th standard related to the 9th standard.

in the Math subject of class 10 the 50 % of part are related to the 9th standard and also the 50% of the part is coming from 9 th standard.

So, 9th standard is basic of 10 th standard.
if your basic knowledge is strong then everyhing related to the subject will be strong .
Hope It Helps.
Thanks.