Grades-Possible to go from a C to an A/A- ?

So right now I'm a sophomore in college. I'm in Organic Chemistry I with a C. I started out rough because on the first test, I knew the material but bombed it due to running out of time. I managed to do ok on the second test that I got back last week. Right now, my average is at a C, and we have one more test worth a 100 points and a final exam worth 200 points. My question is if it's possible to pull a C to an A or A- in a premed course? Has anyone here ever had that experience and can... Grades-Possible to go from a C to an A/A- ?
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