At the B2 level, writing (Schreiben) focuses on complex argumentative structures, formal correspondence, and synthesis of information. You can find related resources and the core textbook materials through these sources: Core Textbook Resources

If you’re looking for a structured way to climb that mountain, you’ve likely come across Begegnungen B2 Schubert Verlag

Carrying a heavy, 250+ page printed textbook everywhere isn't practical. A PDF allows you to study on a laptop, tablet, or smartphone during your commute.