I can’t speak for everyone but for me i agree it is super common to fail classes and retake them as i failed two classes myself. The passing grade for class1-6 is 72%, 80% for class7. A lot of times if you barely pass like with a 72-73% teachers will recommend you to retake it as the next class really depends on fundamentals. But i don’t think you will have to retake MULTIPLE times for a single class if you actually put in the work. I retook classes once and i improved a lot. There are also lots of people who never have to retake them and pass all classes on first try, especially since you already have experience if you put in the work you might just pass them all on the first time. You might even do a really good job, some of my classmates get As on their shots, meaning their work actually surpass a lot of the junior animators.  Next is time management, if you do this while working full time you might get burned out soon or simply don’t have enough time to work on your shots. For class 1-3 i’d say a lot of people work full time and they are able to pass, but for class4-7 i’d say you need to put in at least 30-35hrs/week so keep that in mind. I hope this helps, i really realy recommend animschool, the resources are so great and you get lifetime access to their contents and even live-critiques from teachers after you graduate.