Translation of überfüllt

If you want to learn, you need milestones, so that you can plan your learning curve. Together, we will decide on 3-4 days, where we will study intensely. Perhaps your German will get a little bit better by then.
I will be creating an additional study with a student (his name is Juan), which may appear in local newspapers in the future (in English). However, this may take a couple of weeks too.
Why did you sit on the box? You obviously did not know that there were presents inside. Now, seriously, do you have a backup plan? We must buy new gifts if we want to go to the party.?