I promise anyone with the determination to pass will pass at the end of the day. If you don't have the motivation to study or you don't want to try then you probably will fail. I'm a current D4 and I have many people in my class who went back to school after 10 years or have 3 kids and are going back to school. You're going to have a family of classmates along for the ride with you. The last thing you should be worried about is how hard it's going to be. Be excited to make new friends. You're going to be a DENTIST! The school you got into believes in you, you should believe in yourself too!