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I agree with the others about the angles on the tab and increasing the body font size a smidge. You could decrease the leading maybe a little bit, but the lines are a little wide and the leading helps your eyes to not get lost when jumping to the next line.
Add hover/active states to the green navigation bar.
Also try lining up the grey background behind "About SIM Global Education", instead of breaking it like it currently is. Or perhaps, creating a "fold" effect instead of the abrupt break would look nice?
Lastly, I suggest that you make the home page a little more fun and lively, to entice young college students.

Thanks for the tip on the leading. We really didn't bother with adjusting too much in Photoshop as we could do that later through CSS. Hover states are also a definite interaction standard.
We're still in the midst of getting the home page wireframe approved before it's being designed and put up here.