Hi Ahoo, the questions are rather general ones, such as "describe how your xyz works". Altogether there are about five of these questions, and 90 minutes (?) is plenty of time to answer them. When I did the essay exam, I had the problem to restrict myself to answering the questions, instead of writing a big essay on my application. Check this forum, there must be some posts about which questions will be asked. You needn't worry: I think the aim of the essay exam is to make sure that it was you who did the coding (because only the person who coded the assignment will be able to provide the proper answers). Good luck!