I'd suggest a search on the forum, a lot of people of diverse age and background have commented on appropriateness/dressiness of French cuffs/links etc. That said, my $.02: I wear FC shirts to work sometimes, though I am the only one in my office who does this. Generally, I only wear them when I wear a suit, but that's not a hard and fast rule. If I want to dress them up, I wear silver monogrammed links. If I want to dress them down, I'll wear silk knots, which you can get from BB and others. In between I have some colorful Paul Smith links. I don't have any super-dressy, diamond encrusted decorative links, a la J Hovah. If I'm wearing a French cuff shirt with jeans (some do not like this, and it has been appropriated by the American Jackass) I almost always wear knots. I suppose you're in college from your mention of class? Personally, I never wore a tie to class unless there was some sort of special occasion. In general, I won't wear both a tie and cufflinks unless I'm wearing a suit, or at the very least a sportcoat. I would, however, wear french cuffs/links w/o a tie. These are dangerous waters
Some have very set opinions, which would generally run: FC/links exclusively
with a tie and suit. People with these opinions may include your professors, so I guess think about who will form an opinion about it/you.