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There are several ways of implementing a spaced repetition system into your flashcard studying, but one of the simplest and easiest to use is the Leitner system. Here's how it works.

First, you decide on a number of "boxes" you want to use for your system. I have "boxes" in quotes because I don't own little boxes and am just using rubber bands and labeled sticky notes instead – which actually makes the whole system more portable.

Each of your boxes represents a different study time interval. In a system with five boxes, a good set of intervals would be:

This schedule roughly follows the original algorithm developed by Piotr Wozniak, though I've made a couple of changes. First, I've stopped increasing the interval past two weeks to make the system work for realistic test preparation periods. Of course, you can always add more boxes if you want.

Second, I've introduced a "retired" box, which should hold cards that you definitely know. If you're in college, you're probably already super-busy with other things like trying to find an internship and coming up with money for textbooks, so I think it's alright to consider those cards "known" – but I still think it's a good idea to review them before a test.

Every card starts out in Box 1. When you get a card right, it graduates to the next box. If you get a card wrong, it goes all the way back to Box 1 – no matter where it was. In this way, you ensure that you're studying the material that challenges you often.

After your boxes are set up, all you need to do is create recurring events on your calendar so you'll know when to study each box. Pretty simple, right?