Behavior modification vs usability [on hold]

I'm working on a project that has me a bit stumped. Thanks for any help you can provide!

Background

I'm working on the interface that is shown to a student before they take a quiz. Students are given two attempts to take a quiz to try to improve their grade. We use Gain and Loss framing in the hope to incentivize students to study more between quiz attempts.

Problem

The UI that I would use for influencing the student's behavior is at odds with the usability of the interface, and I don't know what to do!

For example: to encourage the desired behavior, for the student to study more, I would most likely place the "Study More" button last and in the primary button pattern of blue.

However, for usability (I'm making the assumption that most students just want to start their quiz), I would put "Start Quiz" as the last button and in the primary button pattern of blue.

Any recommendations? or guiding principals? Also, recommendations on how to validate with users is helpful too. I'm not even sure how to go about testing this scenario.