Always studying in the same place may not be the best practice. You end up associating what you learned with the location where you learned it, which can be a problem when you need to retrieve it from a different location. There is a body of research about this interesting phenomenon, which is called "context-dependent forgetting." In the context of learning and practicing English, I recommend using your English is a variety of contexts and situations. If you only practice English in the classroom, it can be a real shock when you need to use it in the real world.