The way the system is set up right now, students who are allowed to take retests can only see their raw scores (say, 8/10) without seeing the answers, but they cannot tell which two questions of the 10 they got wrong. This, in essense, renders the retest option totally useless. It's a total crap-shoot for them to redo the test, because they don't have a clue where to start looking for their mistakes. If they knew they had gotten Question 2 wrong, for example, wtihout seeing the correct answer, they'd be able to go back to question two and examine it again more carefully. But without knowing which questions they got wrong, they're second-guessing everything.
Please allow a setting so that students can see their scores without seeing the correct answers until the test is completed.