I'm looking for a script/ book on a very basic level. I am going to finish high school soon and go to university to study mathematics. The books I tried to read (mainly in German, so naming them won't be of any help) are very difficult to understand. I am willing to try out reading a book in English, so if you have a suggestion, please let me know!
In school, we learned about integrals and derivatives, and the Gauß-Algorithm.