IPS messup

i found the calc processes for required return from previous exam answers are quite different from the steps in notes. has anyone got the same feeling??

Can’t really comment yet as I have woefully understudied SS4 and SS5. Just wondering if anyone has any advice as to how to get the grips with these two b*&(#es in the least possible time. Shoud I just do CFAI end of chapter until I get them on-the-money?