Are study.com psychology courses easy and very doable or hard?

[LevelUP]

You can also get credit for other courses completed. I think the same applies to their placement tests, but I'm not sure. For example, if I take placement test on Course A, then I may get credit on related Course B due to the overlap. Again, I'm not sure if this is exactly the way it works, but it may be something to try if you can find overlapping courses that you don't need to take.

This is exactly the way it works! It's very nice to open up a course for the first time and see that you already have, for example, 23% quiz completion progress from having mastered overlapping concepts in a prior course.

There are multiple placement tests for Psychology, do those first.
https://study.com/academy/about/placement-tests.html