How to study chemistry, biology and physics and computer applications

@ ananya 
frst of all read the ncert textbook and clear your besics ,, then move to the numerical part . u can refer any other book fr numerical in phy like h c verma ..
and while studying ncert underline those point which u find to be more imp.. bt remember nt all points are imp. 
fr biology there is certain terms u need to remember , that u hv to practice regularly to keep a hold on it ..
fr chemistry specially organic- clear your besic like nomenclature frst . without that dnt move forward beacuse that will lead to confusion ..
REST OF THE THINGS DEPEND UPON THE HARDWORK ..
ALL THE BEST