My French is currently around level B1+ and I'm planning on spending 2-3 months in a French-speaking country and fully commit myself to improving my abilities. The goal is to have quite good proficiency afterwards (C1-ish).
Regarding my question, is there any good grammar book you can recommend that sums up all the necessary grammar for my goal? It should be compact and make it easy to look up stuff. I don't need pages full of pronunciation or the numbers...just a straightforward grammar would be nice.