Google Analytics Demo Account Doesn't Work

Hello, everyone

I learn to started past days Google Analytics Academy. However I have problem. The problem is Google Analytics Universal doesn't show past data. But The Analytics ask the exam.

Link Universal: Google Analytics Demo Account
Link GA4: Google Analytics Demo Account 2
(The link doesn't show about date 1 Aug 2015 - 31 Aug 2015)

Help me please..

For example:

You can pass the exam many times. Write down the results and try again if you got the wrong answer.