Dear Raahim,
As a matter of fact you will face more challenging studies as you step up the higher classes. Most of the children secure 100% marks in Mathematics however they are not able to maintain such marvellous position in the higher classes unless they work harder allocate more time to their studies; try to solve the curricular problems on their own. So don't give up or lose your heart, "Failures are no more failures if they seem experiences to us".