That the exams are modeled after, "Bloom's Taxonomy of Cognitive Levels"
The cognitive levels are: Knowledge
Comprehension
Application
Analysis
Synthesis
Evaluation
http://tep.uoregon.edu/resources/assessment/multiplechoicequestions/blooms.html
As demonstrated in the link above, each cognitive level shows 'key verbs' to help you identify which level the question is written.