Test zur Deutsch Grammatik A1-A2-B1-B2 is a free Android app developed by LAPPS that provides users with a comprehensive and well-structured way to learn German grammar. The app includes over 5000+ exercises, organized by level: A1, A2, B1, and B2. These exercises are designed to help learners of all levels improve their grammar skills in a fun and interactive way. The app is user-friendly and allows users to learn at their own pace, making it perfect for both beginners and advanced learners. Furthermore, the app offers practice tests that help learners prepare for the B1 exam, which is required for naturalization in Germany. Overall, Test zur Deutsch Grammatik A1-A2-B1-B2 is an excellent resource for anyone looking to improve their German grammar skills.