Hi! I started Duo's German from English course a couple of weeks ago to brush up on my German. I know German, I've passed the Mittelstufe (C1) exams almost 10 years ago, but I wasn't even 15 at the time, German was my third language (I'm Greek), I was never really great at it, I didn't have much contact with the language since then, plenty of time has passed, so I've forgotten a lot of things. What I would like to do is to return to a -let's say- B2 level, without having to take classes and spend money, as I'm a student without a job. I don't have the problem most Duolingo users do with speaking and listening, as I am familiar with the language. But I see Duolingo's course is not sufficient for my goal. I've also started Memrise German 1-7 courses, and what I would like to ask is if there is another Memrise course or maybe any other free app, which is suitable for what I want. I know what I ask is not easy, but I find learning through such apps very pleasant and a way to make use of my free time (learn while walking, travelling, eating, before going to sleep, etc...)

I would appreciate any suggestions. :)