Absolutely! It's much better this way!
Unlike knowing the exam dates, which is important and after all only reasonable, knowing this only encourages min-maxing, which I don't think is a good thing. This game is original and has a lot of scope within it, and I would really hate to see it pander too much to munchkinism.
Mods, that's another story. Make a Mega-Munchkin mod where you get Mega-Skillz for winning every possible bonus in the game, and the L33t can go and play that and leave the rest of us to enjoy a game that isn't based on Mega-Winning