Excerpt from wikiHow:

1. Plan ahead. If you have a study hall, do as much of it there as possible. The more you do when you are in class, the less you will have to do at home. Try to do it in class if time is provided and at lunch, or any other spare time you might have.
2. Get motivated and promise yourself a reward for finishing the dreadful homework, such as an activity you enjoy or anything that you would find enjoyable and doable after you finish. Don't use food as a reward, however! Save a special magazine to read when homework is done or make plans to talk with a friend on the phone as soon as both of you have completed your assignments. Also take advantage of any holidays or vacations that may be coming near. On a Thursday, remind yourself that it is almost the weekend. Remind yourself that Thanksgiving, winter break, or summer break is nearing.
3. Break it up. Take regular breaks. Set a timer; take at most 10 minutes of break for each hour you study. A fried brain absorbs little information. Get up, stretch, and move around...and reward yourself for what you've accomplished so far.
4. Think of the consequences What will happen if you don't do your homework? You'll get a bad grade? Your teacher will be disappointed in you? If none of these things seem to apply to you, remember that homework is to help you learn, which everyone ultimately wants. In the real world, knowledge helps you master the rules of the game...and if you don't know the rules, how are you going to win? If Knowledge is Power...Ignorance is minimum wage.
5. Find a place with less distraction. Set up your special study place. No friends, television, or other potential distractions should be present. Your homework place should also have a hard surface, like a table, to write on. If you need to do most or all of your homework on a computer (as many high school students do) make sure to avoid chat programs, unrelated websites, etc. If you have difficulty keeping focused (or awake), consider doing your homework at the library, at a table with some amount of foot traffic passing by it. The quiet atmosphere will help you focus, the surrounding mild activity will help keep you from falling asleep, and if you get stuck, there are those helpful librarians and references.
6. Get the work done, savor your reward.Don't cut it short or change the plan. Take as much enjoyment from your reward as possible.

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