Is it necessary to learn all the cancer staging

Please help me out

Is it necessary to learn all the cancer staging

Prostate

Kidney

Bladder

Penile

Because the main problem is even if I learn it somehow I am totally clueless while solving questions because staging gets mingled evevrytime.

So can I take calculted risk by simply Revising Breast gynaecological and Oesophagus and Gastric cancer???

Thanx in Advance

Breast and Cervix are most important

You must know these two

Others you can try to remember as much as you can