urgent..What classes should I take for summer in order to apply schools for 2018 cycle?

Hello, here is my stat:

330/330 OAT
3.0 GPA (C- on Orgo 1) - graduated in 2012.

Currently registered classes (for pre-req)
summer 1 - advanced human anat/phys (400lvl) OR Orgo 1 & Bio 1
summer 2 - Biochemistry

Plan for Fall - Retake all the 'C' classes

I am planning to apply as soon as I can when my summer 2 is over (7/28).

But my question is, should I retake 'C' classes first during summer sessions and take pre-reqs on fall? I feel like I should focus on raising my GPA first...

urgent..What classes should I take for summer in order to apply schools for 2018 cycle?