The Duolingo exam is gaining popularity, especially with people who are planning to move to another country. It's true that this test, unlike most of the other options available, is more flexible, allowing you to take it from the comfort of your own home.
Like with any exam, you will need to get familiar with the different types of tasks that you will be required to take, in this Podcast, I will provide an insight into the kind of tasks you will need to prepare for.
As far as computer-based tests go, the more questions you answer correctly, the more complex the test becomes. That is a notable feature designed to ward off those who dismiss this test as too easy or not a heavyweight contender to its competitors.