I only took the 초급 test. To prepare, I only took one practice test and easily scored a level 2, so aside from attending my Korean language classes, I didn't do anything else to prepare. On the actual test day though, I started worrying a bit as the test seemed much harder than the practice test. At the end, I was convinced I was only going to get a level 1, especially since I panicked on the essay portion trying to come up with a concluding sentence in the last 30 seconds and ended up writing: 여러분이 미국에서 살아 봐요. However, luckily I managed to get a level 2! Wah-hoo! :) Now I'm just contemplating if I should take the 중급 test this July.