If you are an intermediate German student, start with these Courses. There is no particular order. Start with what is interesting for you. However, change between Grammar and Vocabulary Courses!
You might also be interested in the Slowly Spoken German News. It might be a bit difficult, but you’ll learn a lot.
German Intermediate Vocabulary Courses:
Free
Free
German Intermediate Grammar Courses:
Free
Free
Free
Free
Free
Free
Free
Free
Free
Free
Free