Must get question correct before progressing or similar
Rather than waiting until the end to find out how many questions were answered correctly, in situations where user must get all questions right, do not allow them to continue on until they have the correct answer. Would need a next button for each question or a way to auto mark as you go. Or when they are shown the questions they got right and wrong when they retry the ones they got right remain and they just need to redo the ones they got wrong.
How about a way to get the correct answer? When they don't have the answer, a way to send a picture or message of the question to an email or something, to get the answer. (Especially for parents who do not know the answer.