Spaced Study or Spaced Practice is a theory of learning that argues, in a nutshell, that students study more effectively and retain more of the information they learn if the study period is “spaced” – or spread out over a number of hours / days – than if studying is “crammed” into short intensive blocks.
Interestingly, unlike so many “contemporary study techniques” this technique not only sounds like it should be effective, there’s also a lot of scientific research both historic and contemporary, that actually supports the basic idea.
If you can’t be bothered to read this document (or, as I prefer to think, you’ll take my word for it…) the Very Wonderful Learning Scientists have helpfully distilled the basics into a teacher / student friendly form.