Sounds like you just need some work building up your test-taking "stamina." Practice, practice, practice.
Also, we don't normally sell services here, but check out [url http://www.veritasprep.com
[/url] (a partner of ours) if you want more GMAT help. They offer courses that focus just on certain parts of the exam, if that's what you're looking for.
If you can get your GMAT score up by 50 points or so, I'd think that you'd have a good shot at any of those PT programs. But remember that the GMAT is just one part of your application! Be sure to present a well-rounded overall application when you apply, including your MBA essays and interview.
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