Hi, I am also using Linux Academy. I think that they have very good content for any course. Although, I always use some book aside. But, what people don't realize about total length of the Linux Academy courses is that they calculate all exercises, labs, quizzes... in total length of the course. So if you add only video lengths of RHCSA for ex., it is around 10 hours in time. Same for any other course.
Any news about your exams?