Retake test with Question Banks

Hello,

I've created a story with four question banks, each question bank has two to three questions. Learners must answer one of the questions from each question bank and must get 3 out of 4 correct in order to pass. If they fail, I'd like them to be able to retake the test until they pass.

Right now, I can click on the "Retake test" button in the results slide, but it only brings me back to the questions I've already taken and shows me my selections, but I cannot click another choice - I.e. I cannot actually retake the test, just review my selections for the test.

I edited the question and looked at the "attempts" button and it's been grayed-out and staying at "one attempt".

Anyway I can change this?

Thanks,

~Kathy