Here is the sentence:
Skipping the directions,
hurrying to finish first, and
neglecting to recheck her work have caused
Claudia to fail every calculus exam this semester.
When you list grammatical items, you must use parallel structure. Here, skipping the directions, hurrying to finish first, and neglecting to recheck her work are all gerund phrases, so the list is parallel. You made a scrumptious choice!