The actual content is almost all reading, often with interactive exercises. The way you pass a course is through an assessment at the end - either a proctored

The actual content is almost all reading, often with interactive exercises. The way you pass a course is through an assessment at the end - either a proctored multiple-choice test or some sort of project you complete and have graded. A few courses have both. For the ones that have a test, there is a pre-test you can take at any time to see how ready you are for the test - for the most part they've been relatively close to the actual tests. I haven't needed help from instructors very much, but when I have had questions they've been pretty responsive. They are also fairly responsive on the "chatter", which is a terrible, limited chat/forum-like thing for each course.