A huge mistake I used to make during school was to tell myself something like:

“The holiday’s have only just begun. I’ll relax for a bit then start in a few days”.

This was almost always a mistake. Why? Well, think of the amount of work you’ve got to do as weights on your shoulder, and when finish a piece of work you lower the weight. By putting off the doing work for a day or two, that weight won’t go anywhere, and often times, during those ‘break days’ I would find myself stressing about the work I had to do and by the time I started, I had the same amount of work to do, only in less time.

So get started on your work now, it’ll be worth it in the long run