Army DEP to army reserves DEp or NG?

I enlisted in the active army last June, but the job I wanted wasn't available for me so the counselor told me to pick one anyway because I can just renegotiate in the future. Well, I did just that. September i went back to MEPS to renegotiate for a 6yr contract. Now things have changed over the past few months. I'm leaning toward the college path rather the military. Keep in mind that I've already renegotiated. Is there a limit to how many times I want to renegotiate? I wanted to go either reserves or NG that way I can still be in, but going to school at the same time. How do I go about doing this. I still have until august 17th!