Just a question... to learn math/physics, is it better to do ~10 medium-challenging problems that invoke some thought, or doing 2-3 really hard problems that require deep thought and lots of time. Up to now I've been doing both, but it just isn't possible to keep up with UT's supplementary problems... I'm 2 weeks behind in many courses because of my stubborn attempt to do so. It seems schools don't value learning so much as rapid routine. So what do I do? A bunch of routine calculations and some moderate problems or the really hard ones?