Reward yourself with something. Make a list of what you need to do and when it needs to be done. Think "If I do it now, I won't have to worry about it later."
Something that really helps me do work is by listening to music so it is not as boring.
And if you fail your classes you'll end up working at McDonald's until you're 60 is that motivation.
Also it's not so much stress if you get it over and done with.
