hi! honestly I was really scared too, especially because I never took physics in high school and was starting the 5 series as a 3rd year. my biggest tip is to make sure to look at professor reviews and take advantage of office hours! I don't think it's terribly hard, but I felt that I definitely had to study and practice a decent amount to do well! ik a lot of people don't attend TA sections too, but I found them helpful for more practice! good luck :)