An extended course lasts 180h. In this course you learn at a slower pace. The teacher provides more repetition. You get more explanations and do more exercises. Don't know how to learn very well? Do you need more guidance? Then choose the extended course.
In a 90h written module you focus only on reading and writing.
In an oral module of 90h you focus only on listening and speaking.
We recommend that you combine the written and oral modules. Then you take a 180h course.