Answering questions you've already seen the answer to can impact both your responses and timing. Since this can result in an inflated score, the system will not allow you to redo problems.

Remember, you can always review completed questions, which is one of the most important steps in getting that elite score. 

And if you want more practice, head over to the Practice page after your homework to create a set based on any question types that you'd like to work on.

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