There are a lot of reasons as to why a college may not accept you. These things can range from a stronger applicant pool than usual to personal errors on the application made by you. If there is something specific in mind that you think might keep you from being admitted to a school, reach out to someone at the school directly or try to speak with a guidance counselor about if they think it will be an issue. Again, the best thing you can do is take your time on your application and seek help from those around you!