Go to a movie. Or to the beach or a park. Chances are that whatever you have not yet learned you will not learn in the last 24 hours. Plus, a rested, fresh brain will stand a better chance of reasoning out the correct answers than will one that's crammed with facts it hasn't yet had time to process.
Give a man a fish, he'll eat for one day. Teach a man to fish, he'll drink all your beer.
Cheers, Jeff (SCJP 1.4 all those years ago...)