1) If you go to a college with smaller classes, usually the teacher will wait for re-assurance to move on to the next slide. Be the guy who speaks for the class, don't jump the gun and be a jackass about it, but if nobody has questions then give the professor the cue to move on. It makes class go smoother, and it is fun. Also shows leadership

2) If a cute girl gaffs in class a little, make a light joke about it. There's a right and a wrong way to do this... the keyword is light, and sometimes it might just be better not to say. Use your social intelligence...but make class a little more fun, establish an IDGAF attitude but be fun about it. Most of the time, you can establish a playful relationship with these girls, and getting their number is easy at that point.