I'm attempting to make a pre-class quiz that helps guide students to the topics we'll cover in class. I was hoping to use the Quiz feature to do this, but it's not quite what I had in mind...let me elaborate:

I want to give my students instructions on preparing for class, and give them some previews of the content of the coming lecture by having them follow a guided exploration of the subject. I want to ask them questions and, upon entering their answer, IMMEDIATELY (before moving onto the next question) see the comments regarding its correctness/incorrectness (rather than seeing them at the end, after submitting the whole quiz). 

In fact, I'd really like them to be able to retry their answer immediately as well, until it's correct, rather than redoing the whole quiz.

Is there any way to get somewhere close with this? Or is there another external service that you might suggest?