Time Management Re-evaluation

So I have tried my best to keep a routine and save "fun time" for later when I have finished my homework, but there have been a few issues where if I don't do the fun time at a certain time, another opportunity won't come for some time, so then I don't always finish my homework before I do other activities.  I have been getting better with not going on facebook as much, but I still break that rule once in a while because I really want to...and that is a no-no.  Lately it seems as if the harder I try to be more organized and finish all of my work, the more homework I get.  And I have so much to do this weekend, but with tennis individuals this weekend, I don't know how I will be able to fit in everything I want to fit in.  So my next rule is to do the most important homework first, and make sure that is done and then whatever remaining time I have, spend wisely on the other assignments.  I guess I don't mean some homework is more important than others, but I mean that some assignments have a higher priority of getting finished before others, assignments that may affect my grade more drastically are examples of higher priority homework.  I just want to do the best I can and succeed, but I think in order to do this, I must master time management first.  So, my improved set of rules for time management are:
1. NO FACEBOOK until other assignments are fininshed.
2. If my schedule is very busy and I feel like I won't be able to finish everything when I want to, then I must do the high priority assignments first and go from there to get the other homework done.
3. The less time I spend pondering how I will be able to finish all of my homework, the more time I will have to actually finish it.
4. Use extrinsic incentives to finish my homework more quickly (but also the right way), such as going on facebook, watching movies with friends, calling home or friends, writing letters, or surfing the web once my homework is all done.
I think these rules will help me get back on track when I feel like I'm going to go insane or possibly spontaneously combust (just kidding about the last part).