Can I review questions by recall rating?

Yes! The Study Something Specific page allows you to do all the flashcard questions you've rated historically low (1's and 2's) and/or moderately (3's) for a custom quiz: https://www.youtube.com/watch?v=R7hbqVA7FMs

As far as cases go, we'd recommend you start with questions you've never done before (these will be selected by default when you hit "Solve Cases"), and then your next priority should be cases you've answered incorrectly in the past.