Well, you may have a bigger issue…
It appears from your previous posts, that you didn’t finish high school, so your science foundation may be very weak.
And, it sounds like you’re not a very good test-taker.
Are your writing skills weak as well?
MD/PhD students generally have very high MCAT scores, along with an excellent GPA. I’m guessing that the PhD portion of their program requires or expects good writing skills (but I’m just guessing).
To answer your Q… you will have a tougher time if you start at a CC. You won’t likely be doing research at the CC and when you transfer to your univ, the students who’ve been there will likely get the plum spots.
It is extremely unlikely that you could be a successful MD/PhD applicant if you are a traditional applicant who applies the summer before senior year begins. But maybe it is typical these days for MD/PhD to apply after gap years, etc.
Why do you want to go the MD/PhD route?