Well, the BLURB has a suggestion or two (or three or four) for you.
#1--Record on a calendar all of the tests, papers, projects, and assignments that you need to deal with before the end of the semester. Then, backing up from the due dates, block off the time you'll be devoting to each of those items. If you can't find the time on the calendar, you probably won't get it done. Be realistic about this. By this point in the semester you know how much time and effort is required. Plot it out.
#2--Don't take on extra hours at work. In fact, if you can give up some hours that you would really spend on studying, you should probably give up some hours in the next three weeks. Remember that spring semester doesn't start until the 26th of January, so you'll have lots of time to put in extra hours after finals.
#3--Have fun with a last minute Holiday Challenge. If you're feeling pressure to do holiday preparation when you really could/should be hitting the books, tell yourself that you'll do a concentrated Christmas thing this year after your semester is completed: all your shopping in three hours, baking in one big push, wrapping in a flurry, etc. And, while you're at it, stay local--save time and money and help the local economy.
#4--If you are taking a break from school work--make it a good one! There are some great events coming up on campus in the next couple of weeks. Check the campus calendar for the things that will appeal to you most.