Keep a strict schedule and make sure you have the supplies in place to enforce it. Get a personal organizer and take it with you everywhere. Take all plans and assignments into account. Try keeping a desk calendar or keeping track on your computer. Get a filing system for all of your school work. Make sure that no matter where you are, you have reminders of what you need to do.
Study and work on assignments some each night rather than counting on doing everything all at once. Putting off school assignments is not only stressful, it can result in work that fails to meet the standard you would otherwise achieve. Last-minute completion does not often yield enough time to go back over what you have written and make necessary changes. Last-minute cramming for tests or quizzes also leaves gaps in your knowledge, as you often do not have time to cover everything.
Make sure to keep your social life and work schedule (if you have a job) in line with what they should be to accommodate your school work. If you have your day planned out and a friend calls wanting to do something, you should tell them no, even if the offer is tempting. If you get off track once, you are bound to keep doing it. This is not always easy but a clear schedule that is adhered to will help you stay organized and on track.
Throughout the school year, there are bound to be times when you need to access your previous assignments and notes. Make sure to keep anything you feel you might need down the road. Have an organizational system in place so that you can quickly pinpoint the papers or notes that you need to see. This will help you with future assignments or tests without the trouble of sifting through unorganized documents for hours.