Mainly through experience. As well as writing quiz questions for other people, we write them for our own use. Our quiz writers and editors also host live quiz events, which is where we are able to get feedback on what is easy and what is difficult for a very wide range of demographics.

Moreover, we offer a service called QuizTester which allows us to test some or all of the questions written for you on people from appropriate demographics from our QuizTester panel to see how well they do. We can then adjust the questions and levelling appropriately.

If perfect levelling is very important to your application, then this is the best way to achieve the most accurate levelling possible.

Even without this testing process, you can still have complete confidence that the levelling will be very accurate.