Hi. This is built in with the Lesson Module. Lesson works like individual cards. So, not only could you do this by question group, but by question. For example, if the student gets A1 incorrect, you could send the send the student to B1 OR send the student to a support page, then to B1.
This could also be done with two quizzes and the Restrict Access settings.
This could also be done with two quizzes and the Restrict Access settings.