Dear Rüdiger,
I know that you don’t like going to school and I also know that you get bad marks/ low grades there, but now I want to tell you how important education is! You don’t know the reason that makes it so important? If you don’t work for school you won't get a job so you can’t earn money! You also need to learn to improve your general knowledge to get good grades at school and to make your parents happy! Education is very important to get the right qualification for a good job because if you have a good job, you can enjoy life. With the right education you'll become more confident and become a good citizen! I hope you accept my advice and understand why education is so important for you! If you have any questions, just ask me! (Just answer me)
Lots of love, your Grandfather
Ich hoffe ich konnte dir damit helfen! LG Pitschi