Make a list of what [you think] needs to be done.
Think about WHY you think you should do each of those and what the repercussions would be if you did not. Make brief notes about these underneath each of those items.
Go over each item listed and prioritise.
Write two dates against each of the items.
The first one is when you feel it should be finished by.
The second is the ultimate time when it simply MUST be finished by.
Write down what you think would deter you from not putting your own rules into practice. . . eg: No going out with the gang until I finish items 1 and 2. etc. . .
You may not accomplish every step you have listed, but I bet you will get through quite a few.