- one called "Grammar", to hold all the grammar quizzes
- one called "Vocabulary" to hold all the vocabulary quizzes
- one called "Listening" to hold all the listening quizzes
Add a pre-condition of "Previous quiz" to every quiz except the first one.
Add the following post-conditions to every quiz except the last one:
- score >= 80% next quiz
- score >= 60% same quiz
- previous quiz