no need admire one lah. my grades oso not say very power, i was
a B grade student hahahhaa, nvr really aim for A.
truth is that, if u pay attention in class, and do all your
tutorials, so no problem one mah.
normally a textbook inside got some sums, lecturers only ask you do
a few right?
that time i bo liao go do all of them loh. 
it's about understanding the subject, not memorising it. books are
dead, you are alive, remember that. 
u dun have to read thru the entire textbook, just look for wat is
important and learn that.
when u are able to explain something in yur own words (singlish oso
counted haha) that is when you have finally understood the
subject.