I didn't sit these tests so take this for what it's worth. I did however take both Macro and Micro at a regular Uni in a classroom setting.
I think part of the problem is that you took the exams out of order. Regular classes invariably teach Macro and then Micro. This is because many of the principles are the same, and the Micro class builds on the priniples taught in Macro so hopefully you'll do better on Macro.

As someone else noted you may be better off to take a course at a local Community college. My local CC offers both courses entirely online. Its a CD based training program, and if you take it during the summer is only 5 weeks.
You'll have a better shot at doing well, you'll probably learn more, there will be less stress and most Community Colleges are dirt cheap.