I haven’t found college to be easier than high school. High school, for me, was a snap.. I had enough study halls where I never even had to bring a book home!
Some college courses are easier than others. 101 classes are pretty simple; I think I have A’s in all the 101 classes I had to take, with very little effort on my part. As I got into upper-level classes, such as ones requiring prerequisites, 300 and 400 level, etc., I found I had to put in quite a bit more work. The classes were more demanding and difficult.
I also found other factors contributed to how difficult a class was. The professor makes a huge difference. If you have professors that mesh well with how you learn, things are much easier. If you have a professor that has difficulties getting the concepts across and makes ridiculously difficult tests, the class is torturously difficult. Class size made a big difference for me, too. I did much better in smaller classes (100 people and below) than in bigger ones (200+). Often a class’s lab would be ahead of or out of sync with the lecture, so that added to general confusion.