30 minutes back

In 30 minutes back you are a little girl who her dad found her exam paper and she got a bad mark, but you have a time machine you can travel 30 minutes to the past and comeback ,the only problem is anything you do can cause a huge mess to the timeline -There is only 1 way to win the game think carefully and you will find it its pretty simple. -Every time you do something use the time machine to go back to the present and check what happened.