I'm going to see if we can move this thread to the College/NCAA forum!
But on topic, Stanford is known as one of the hardest schools to get into for sports because athletics aren't enough! Some schools, esp big states schools, being an amazing gymnast and doing ok at school will get you in. Other schools like Ivy Leagues, you can be an okay gymnast but a great student. Stanford is both! You have to perform at the Stanford level of academics which would mean a GPA about 3.0 and you have to have honors/AP classes. Also you'll need to have above 2000 on the SATs for sure. Then for gym you'll have to be around a L 10. If you are in this category, congrats you'll do great! If not, don't worry there are a million other schools that will be a better fit for you. How old are you? What level are you? Those things will help you decide which schools to look at.