Hello! Yes, many people apply in fourth year, but since I didn't find the program until third year, I had to do some of the prerequisites in fourth year. I ended up applying a year later after I graduated since it's better to apply after you have all of your prerequisites completed (although you don't have to). You need a four year degree in anything as long as you have the required prerequisites (many people get in with a BA). My advice would be to start volunteering with an SLP now to see if you like it and to accumulate volunteer hours, and start taking the prerequisite courses now. Also, focus on getting the best grades possible in your prerequisite courses as well as your GPA (they look at the last 2 years worth of credits at the time of applying). Let me know if you have any other questions!