It's not the end of the world if you fail a class in high school. What I would recommend is taking a Geometry class at your local community college so that you "make up" the grade, most ideally during summer vacation. I had the exact same situation as you in high school, except my failing grade was in Chemistry. I had always preferred Biology and Physiology over Physics and Chem, but I had to take one year of physical science to get into college, and frankly, my Chem teacher was a b*tch. I worked with my dad for three hours every single night on the homework and still didn't pass her class. So the next summer, I took an Intro to Chem course at my local community college, and something I realized was that at CC, the professors are A) more reasonable, B) more organized, and C) are more willing to help you if you go to them with questions. I got a B in my summer Chem class, got into my dream college, and actually recently just graduated. What I'd suggest is having a chat with your high school counselor and your parents to find out which class you should take over summer that would be the equivalent of your school's Geometry class, and sign up for it. Another advantage to taking it over summer is that you won't have any other classes to worry about, so you can focus just on your geometry course.