Review
Go through the flash cards one at a time and rate how well you knew each one. Cards you miss come back within a few more; cards you already know are pushed further and further out.
Spend your time on the cards you keep getting wrong
Going through a deck in order means spending just as much time on the cards you already know as on the ones you don't. Here, every answer is graded and the deck is reordered around it: miss a card and you'll see it again soon; know it and it moves steadily further back. That means more of your study time goes toward the things you haven't learned yet.
This review mode is built for studying hard in the weeks before your exam, not just for a few minutes a day. A card you fumbled this morning can come around again this afternoon. Your progress stays in your browser, and if you take a week off, cards you haven't seen in a while will start appearing more often again.