I was reading Nevermoor today which triggered a memory of a book I once read while visiting the library. It was some 15 years ago, I was obsessed with Harry Potter so I was probably searching for something similar.
The details are super blurry; I think I can remember the beginning of the book - a young boy around 11 years running through a hill/forest because he is late for something. I think he is a wizard's apprentice but not a very good one, so that's why he is terrified of being late, he will turn up to be incompetent again.
There is a school for witches and wizards and I think he will go there eventually.
I thought maybe it was Septimus Heap but when I bought the book for my Kindle I don't think that it is anymore. I'm googling it like crazy and can't find it.