What is 'Test mode' in an extra practice?

What is 'Test mode' in an extra practice?

'Test mode' allows you to set a practice under test conditions. Under test mode, your child won't be able to see how many questions they answered correctly or incorrectly until the end of the practice. Your child also won't be able to access the help sheets or videos while answering questions.

To complete a practice under timed conditions, you can also set a time limit.