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.

>>41
Ashkenazi Jews are smart. Shockingly brilliant, in general. Impressively greater in brain power than the bulk of the human population. People who can’t comprehend the easily understood data verifying high Ashkenazi IQ may not simply be anti-semitic; they must also be crippled in the math/logic zone of their inferior parietal cortex, with subsequent IQ in the ~85 range.