If you have to race to C class, you are simply not practicing at all. Sounds harsh, but it is totally true. I never understood the "shoot for a C mentality." You should be shooting for the top, and if you so happen to fall at a, b, c, or whatever, then so be it. But aiming for the C? I dunno about all that. If you aim towards better long term goals, you will meet all of those other lower levels along the way.
Ben's newest book has a great reality check section for shooters with the "settle for X" mindset.