Szkolny Leń is a free Android application developed by Konrad Kurzydym that falls under the Education & Reference category. This app helps students keep track of their grades and maintain their academic performance. The app allows you to enter the subjects you are studying along with the expected average grade. Once you have added the subjects, you can then add the grades you receive. The app will then calculate your current grade average and suggest ways to maintain or improve your score.

The app is easy to use and provides a simple interface for students to track their grades. It is a useful tool for students who want to keep track of their academic performance and maintain their grades. However, it should be noted that the app is only for informational purposes and does not encourage academic dishonesty. The developer also does not take responsibility for the grades on any official documents.