Reddit reviews Basic German: A Grammar and Workbook (Grammar Workbooks)
We found 2 Reddit comments about Basic German: A Grammar and Workbook (Grammar Workbooks). Here are the top ones, ranked by their Reddit score.
My personal favourites are (German Grammar Drills by Ed Swick) and (Grammar Workbooks by Heiner Schenke and Karen Seago), not to forget (Intermediate German: A Grammar and Workbook by Heiner Schenke and Anna Miel). All are great book for practice and really fun exercises to do.
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I suggest you take a look at the Common European Framework of Reference for Languages. In my opinion, two and a half months may be enough to get to A2 if you have the time to spend in learning the language. Don't forget to check the Wiki out, there's a lot of good (and free) resources there.
First: Duolingo and Memrise are good for getting to know new words. Alone, they won't be much help in understanding how to actually speak the language. It's a good start, but it won't take you much further.
Second: you will have to learn the grammar. I spent months on Duolingo without a proper grammar lesson and I got to the point where I was only trying to guess the answers. You can watch Deutsch Für Euch and German with Jenny videos. I used this grammar to learn and I think it is good enough.
Third: you can use the first month to focus on A1 and the second month to focus on A2. I'm saying this because it can be ridiculously easy to feel overwhelmed with German. It will seems like you learned nothing and that you still have a ton of things to study, this is normal. It is very hard to go further than A2 in only two months, so it is better to focus on what A1 and A2 levels need to know and study it hard. If you feel that you know it already and you still have a couple weeks left, you can adventure on B1 lessons. Plan it wisely.
Fourth: listen to a lot of German. You'll be surrounded by the language very soon, and you seriously need to get used to the sound of it. There are youtube channels like Easy German and podcasts like Slow German that can help you with that. You probably won't understand what is being said, but it is good to get used to it. Deutsch Welle has a few podcasts and interactive courses that will help you.