For school, I'm taking some online courses, which are graded almost completely by 10 question quizzes that cover each lesson. Any question wrong is a drop of 10%, so it's very important to try to get everything right. Unfortunately, the questions are often quite ambiguous and opinionated, and leave me stuck between two choices.
In describing how I felt taking the quizzes to someone, I had said that they were tantalizing, but after looking the word up to confirm that I had used it correctly, I found that it was a bit off from what I wanted. I think unnerving would be more appropriate, but what would the SE community say is the best way to describe tests like these?