Agree that back-filling any gaps can really really help when confidence is lost, so a resource that would allow for quick scan to identify/ address missing pieces can help.

Not a solution, but possibly an article that might help back you up a bit, is on AoPS: Dealing with Hard Problems. www.artofproblemsolving.com/Resources/articles.php?page=hardproblems

So hard when you see so much ability and all they see is inability. frown