The App component is fairly overburdened in its functional responsibilities and state. In the future, I'd want to leave App primarily responsible for toggling among "begin," "practice," and "end" displays and fetching data from the API endpoint. A PracticeSession component would live between the App component and keep track of available quizzes (quizzes that have not yet been answered) and review quizzes (questions that have been answered incorrectly). The QuizCard component would continue to check whether an answer had been answered correctly or incorrectly.
The App component is fairly overburdened in its functional responsibilities and state. In the future, I'd want to leave App primarily responsible for toggling among "begin," "practice," and "end" displays and fetching data from the API endpoint. A PracticeSession component would live between the App component and keep track of available quizzes (quizzes that have not yet been answered) and review quizzes (questions that have been answered incorrectly). The QuizCard component would continue to check whether an answer had been answered correctly or incorrectly.