Feature request: ability to move back and forth between questions before and after submitting answers.

When I am working on practice question or quizzes or tests, I would like to be able to move between questions before and after submitting the answers. I am doing math courses mostly and I make a lot of careless errors so I like to check my work before submitting the answers. But I have to wait some time for my mind to reset before checking my work otherwise I make the same careless error when checking it. The way things are now, I can only do one problem then wait a while and check my work, then do the next problem and wait and check my work etc. It takes me a long time to make progress. If I could look at all the problems in the practice or test and work through the answers, then wait to check my work and then submit them, I could make much faster progress. (This is like how we did tests in the old days when we used paper, I would answer the questions and if I had time left over, I could check my work before turning in the test.)

I would also like to look back at the problems after I submit them. Sometimes I have questions or I want to report a problem but can't because I've moved on to the next question and there is no way to go back.