If you go to your profession tree it shows you a grade number and how far you are to getting to the next grade (xp bar). Each chamber has a recommended grade that you can comfortably complete that wizard challenge. If the text is white on a room it should be pretty easy for you to beat but if it's red it's going to take more resources like potions to beat. I've gone at least 4 higher than what it recommends I go but it took a lot of potions to get through them.