I love the CodingBat platform and plan to integrate it throughout my course next year. Yet, since it will be my first year with AP CS A and I have not yet had a chance to study past years' FRQs, I'm not sure which sections I should focus on more than others.
Based on your experience, what sections of CodingBat are most helpful in terms of preparing students for the FRQs on the AP Exam?
(Note: I am asking about the problems already on the site, not ones I could author myself -- that's a separate topic as I see it.)