The capstone. Fifty questions drawn across the whole subject — not recall, but connecting one fact to another and applying both to something real.
Score 80% or higher to earn a certificate.
Six themes: how the pieces constrain each other, design trade-offs, field scenarios, myths corrected precisely, the numbers applied, and where the technology came from. This one assumes the other quizzes; if a theme scores badly here, that is the quiz to go back to.