Quotemy instructor tells us that whenever we read an argument, we should ask whether or not the argument is good.
While it may be a fun exercise, I have to disagree with your instructor. The test writers almost always let you know if an argument is good or bad ahead of time. Flaw, Strengthen, Weaken, Parallel Flaw, Necessary Assumption, and Sufficient Assumption are always bad. Inference and Resolve/Explain questions don't have a conclusion to be bad. Reasoning, Roleplay, and Point at Issue questions don't really matter (well, it may be helpful occasionally for Reasoning Q's). The only place I can think of it being helpful most of the time would be in parallel questions.
I feel like i am more of an active reader when i read with that purpose; in addition when you don't read questions beforehand it seems like a good strategy.