Improve your TOEFL speaking score by following this one tip

Hello TOEFLers,

In the following video, you will see two of my Online TOEFL Course students completing independent speaking tasks.  The first student’s TOEFL speaking score is approximately 14-15 pts out of 30, and the second student’s TOEFL speaking score is about 23-24 points out of 30.

As you watch the video, pay attention to the intonation patterns of American English of both students. Why does the second speaker have a better intonation than the first speaker?  How does your intonation compare to these two speakers?