When you click on a question number, you'll have a chance to try it. Unlike the actual test, you can take your time, listen to things multiple times, and easily see transcripts of listening passages. And you'll instantly find out whether you got each question right or wrong. It's a good way to study and practice Korean, if you already know some.
If you make an account, below, you can keep track of all the questions you try, from any computer. And more account features are on the way. But it does send your password in plain text, so don't use your bank password, okay?
ps: I don't make these tests, I'm just putting them online in a convenient format. You can email me with any issues or questions at firstname.lastname@example.org. The test's real home on the web is www.topik.go.kr, where you can sign up for a proctored test and so on.