Quizzes have changed; previously 20 questions at a time were presented. Now, all questions in a category are presented at once. That can lead to a 'quiz' of 300+ questions -- and yet, we are still asked whether we want the quiz to be graded after each question, or at the end. Surely no-one wants to answer 300 questions in one sitting? Please revert to presenting them 20 at a time.