Answer :
try to understand me. Learn Them in queston i mean to say you know in cone there are maily volume,c.s.,t.s,f. So only learn volume and t.s.f b.coz c.s can be obtained by minisuing an circle easiest way is like this
you know theres no shortcut to success....please keep practicing as many sums as you can....and you will automatically rembr them.....if possibl prepare a formula sheet and revise it daily....thats all....