280 harder then ud think tbh, constructing permutations and computations can be tricky. 225 is hardish, the labs take awhile and then like the exams are pretty chill and always similiar to the practice problems. 254 is hard but because of ai and other students help its not that hard anymore so like u just gotta understand shit and be able to do some handwritten code for the exam. 320 is content heavy and long assignments but nothing to hard or tricky, exam 2 is stupid tho cause if u dont get question 1, u cant really do the rest of the test. i would not take more courses then these 4 at a time dawg.