>>10852396Take further maths As level. If you're feeling confident take the full A level. It's doable in a year. Many private schools do the entire fmaths A-level that way. If you can, take physics. You don't need to have an in depth understanding of it; you just need to know when to use which equation.
Alternatively, get an apprenticeship in computing/engineering for a year and self study the A-levels.
