Yes that would be great. Have you thought about also integrating the review button/controls into the deck sections? So that you could select specific sections of a deck (or the whole deck) either for testing, or also for review?
What is the rationale for keeping review and testing in separate parts of the app? I understand that testing is for checking your own knowledge for just learnt sections, but the deck interface could be actually a very nice location for intuitively handle multiple deck sections for review selection (especially if your retention score / test score would be somehow indicated for each of the sections)