How can I learn German in one week?
If there is way to listen and talk that will be better.
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If you want to learn some formulas as Guten Tag, Auf Wiedersehen, Danke, Bitte, Ja, Nein, and so on, I think you can do it in one week. Whether you can call this "to learn German" is another question.
There are books available that promise "Learn German/English in thirty hours" - that is throwing sand in your eyes. They mean thirty lessons of German/English and contain nothing but a basic survey of the basic grammar of a language and perhaps a vocabulary of 500 to 1000 words.
Don't fool yourself. The study of a foreign language is always a study of several years, no matter how many people tell you you can learn German in a week. They want to sell you something. And they promise you the moon.
And studying a foreign language has its price. You need good tools for learning a language. A dictionary for beginners, a bigger dictionary, a good grammar for beginners, course books, audio material, texts for beginners - all that has its cost. And when you engage a private teacher, he has his price too. Good things cost money.
And forget "Crash Courses". What you learn in the one week of a crash course you have forgotten in the next week. Some people think learning a language is another person that fills the language in their mind. No, learning a foreign language is a technique you have to learn for yourself and most people who learn a foreign language know nothing about the technique of learning a language. It is an active thing, not a passive thing that others do for you.