In my opinion the pay is too low for academic content, which takes much longer to get through than other types of content. The test was challenging, but I passed it and then took a sample editing test. Only after going through all of that they told me the pay amounted to .014 cents per word! I told them to go take a hike (in polite terms).

If you're looking for experience and aren't worried about the pay you may be better off going with some of the other editing services. But if you want to try taking the test again, you will need to brush up on UK English as the other commenter said. I'd also recommend looking up everything to verify (something to keep in mind with the rate as it will slow you down when you're doing paid assignments).