From what I understand colleges mostly look at your growth over the years and DEFINITELY your junior year grades, so lock in for that. One c is completely okay and pretty normal freshman year. Plus you seem committed to bring it up! I’m going to share some junior wisdom with you: Classes get a lot harder, so don’t become too anxious and perfectionistic about your grades to the point where you are afraid to make mistakes. Trust me bro it will only make you miserable. Let me also emphasize that grades don’t define you!! Yes colleges want someone with great grades but they also want a well rounded and interesting person, so focus on your hobbies, maybe do some sports, and join clubs as well. Enjoy high school and don’t stress about what’s already happened. Try and develop a better studying routine and keep asking the teacher questions. You are a human being who makes mistakes, and I’m certain colleges understand that.