How do I learn maths?

I forgot maths. I did maths for my GCSEs and A-levels, but I did bad and I want to learn maths.

Is there any book that will teach me maths? I keep coming across books by K.A. Stroud. Are they good? Should I get those?

Keep in mind this is British maths, not American math, so if there are any differences, I would prefer the British version.

>>81

Emanuel Schäfer, Chief of the German police and Gestapo in Serbia, could boast as soon as 1942 that:

"Belgrade - the only larger European city which has been cleansed of Jews, has become judenfrei."