Some students may struggle with procrastination, and getting things done in general. I know that in high school I had moments like that. We all can fall prey to it. I recommend the following steps to help deal with this:
1 - At the beginning of the week (e.g. Sunday afternoon or evening) make a complete list of everything that needs to get done that week - studying, homework, writing the first few pages of a term paper, and so on. Break large tasks (e.g. a 20 pagae term paper) into smaller tasks that can be discretely scheduled into a given week (e.g. completing the outline, or looking up at least 4 sources, or writing the first 2-4 pages of the term paper).
2 - Estimate how long each task will take
3 - Use a calendar (either paper or electronic e.g. Google Calendar) and schedule in everything. Make sure to schedule in time for breaks, leisure, eating, showering, sleeping - everything. Also leave some safety margin each day, in case certain tasks take longer than expected or unforeseen difficulties arise.
4 - As the week progresses, make sure you stick to the schedule you created for yourself. Ask a friend or family member to help keep you accountable.