Well I see you're working your way through our High Road Online CDL Training Program so you're certainly not going to fail your permit test. But the answer is it varies from state to state. Some will allow you to come back the next day, some make you wait a week. You would have to contact your state's Motor Vehicle Office to find out what their policies are.
A CDL is required to drive any of the following vehicles:
Here in Missouri I believe you can try it again the same day if you fail. Then I think you could try three days in a row or something. Keep pushing through the high road training and you shouldn't have to worry about it.
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If you fail your permit, how long do you have to wait to retest?