why I review introduction to algorithms?

several days ago,while talking with bealone,I said I'm reviewing introduction to algorithms;to this, he said why?
I don't really know why; if I'm just preparing for my graduate life or the exam,it may be redundant,which is quite correct.
I'm pretty sorry for I don't precisely know what I need; can I looking forwards a better university? or maintain current situation?
for my rank-list is not at the top,I am not confident for my choice?
maybe time will confirm what I need to do; now just prepare and wait;
conbadei...hihi;