Effective time management often requires a device or other apparatus that helps to keep us on track. A planner isn't the only tool you can use; I like to use a checklist any time I have an important job to do, especially if it will take several days or weeks to complete.
The next time you have a big writing assignment or project that will involve many steps and stages, you should start by creating a checklist or a timeline. Carry it with your or keep it in your homework space - but just to be safe, keep a copy on your computer as a backup.
You can use my ready-made lists or create one of your own: