Thanks for the updates, sir... it helps out!
So, first of all, good luck on that test, and I really hope you can hit your target score. If you can hit a 700+, then I think your (approximate) "Sweet range" will lie somewhere in schools ranked 20-40 (US rankings, I mean). (PS. I would definitely suggest Rice as a target school, with their fantastic energy program and connections) You have a nice solid profile in terms of work experience, but your school is a bit unknown, your grades are somewhat middle of the road, and you come from one of the most competitive pools around.
The good thing is that pretty much any school will help you reach your goals, since all schools train you for management consulting. The only other thing I would suggest is to drop your goals of entrepreneurship. If you don't have PROVEN success as an entrepreneur, your dreams will sound like "pipe dreams" to the AdCom, so it is probably better if you can come up with alternate, "Safer" goals, even if they are more traditional (like moving up the hierarchy of an already established energy company)
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