I will let my peers who are medical doctors answer this question more specifically.. but I think if you focus on getting good grades, and really make sure that you know why you specifically want to be a physician (vs. any other career) then I think you’ll be ok! 🙂
First to be a doctor, make sure you have a sincere passion for this career. You need good grades to be accepted to medical school. I advise you work hard on all subjects because they contribute to your overall grade.