>>11087559If you absolutely want to do a online course: omb+ brückenkurs
Its a pretty decent Abitur recap and while you Go trough highschool stuff they indroduce you to Notations that you will come across in university.
Maybe your Uni will offer "Mathe-Vorkurse" before the Semester Starts.
If you want to work ahead go trough some linA and analysis scripts you find online. Fisher lineare Algebra und forster analysis are decent and written in german if you want books.
However you will learn Literally everything from scratch in university.
I was a neet for two years after highschool and started math this Semester only doing the Brückenkurs an im doing fine with the weekly Problemsheets (before i started university i couldnt have solved a single question from the Problems you posted, now after two weeks i could do it no Problem)
Also a big Part is Learning the "math language" and all Notations. Maybe learn them beforehand so youre not that overwhelmed when they get indroduced.
Also work on your arithmetic skills (Brüche, potenzen, Gleichungen umformen und vereinfachen), imo thats more important than knowing all the highschool stuff.
