Cooking pasta correctly is an art, but there are some basic rules to follow if you want consistent results.
If you want to avoid this situation in particular, take the pasta out just before it’s done along with about 1/4 cup of the water and add both to your sauce and finish cooking the pasta there. You’ll end up with pasta that is cooked perfectly with a sauce that readily adheres to each noodle and no stickyness
I believe these are put in place to actually test your knowledge of the vocabulary and grammar, vs just being good at memorizing the handful of simple conversational samples.