Rephrase the answer into a statement incorporating the question. Example:
1) Which of the following prostaglandins does aspirin MOST inhibit
a) prostacyclin
b) cyclooxygenase
c) thromboxane A2
d) a & b
e) b & c
So you would say:
a) aspirin most inhibits prostacyclin
b) aspirin most inhibits cyclooxygenase
c) aspirin most inhibits thromboxane A2
yada yada...
I've found that the sheer amount of information, even in a simple question like this, can overload a student when they're flying 10000mph on a timed test. So a trick is to slow it down and rephrase the responses.
Second is to be wary of what I call "restrictions" on the answer, in this case, it is the word "MOST." It's words like "best," "least," "except," etc... you can read a question, understand a meaning, then hit this word, and it'll technically reverse the meaning you've pulled from the question.
In my question above, "MOST" will automatically knock out answers d and e, since "most" means one. Look for these "automatic knock outs" (there's another one I'll share in a second). Auto knock outs help greatly when you're faced with I, II, III, I and III, II and III questions. By eliminating just one statement, you're guaranteed to knock out at least 2/5 of the answers. By knowing/discounting 2/3 of the statements, you'll get the answer. Not bad for knowing only 2/3. Anyway, back to the question:
So the following should be taking place in your head:
a) aspirin most inhibits prostacyclin
I know it inhibits this....I'll keep this answer, for now...
b) aspirin most inhibits cyclooxygenase
This is true, but the question asked for a prostaglandin, this is an enzyme. Auto knock out!
c) aspirin most inhibits thromboxane A2
Okay, between the two...I know this is more inhibited. This is the answer!
and just for kicks, since d/e asked for a&b, b&c, since you knocked out b, these are both knocked out by association.
So the answer is C, aspirin preferentially inhibits thromboxane A2.
Anyway, you get the idea. This sounds labor intensive but you should be able to crank out those statements on the fly and within seconds of reading the question. I'm pretty liberal when it comes to marking up a test as well. Hope this helps.