Is Test Masters worth it?

<p>Hey guys,
I was looking on the Testmasters website and they have a 4point act gaurentee. I mean this is crazy. I'm looking to get a 30 on my ACT by june and then take this course over the summer. My parents are definantly willing to drop 5k for a 4point increase because a 34 will get me into any college I've ever wanted to attend. However, what are the chances? A 4 point increase in my score is HUGE how can they possible help me achieve this.
Thanks for the help</p>