Self Teaching A-level Maths and Further Mathematics in 1 Year

Hi, I am a UCL Chemistry Graduate who has been working in finance for the last 2-Years I have no formal education in Maths, although my degree was quite quantitative and a lot of maths was covered throughout my degree. I am currently looking to pivot my career by doing a CompSci Masters and to make myself as competitive as possible I am considering completing Maths and Further Maths in the next year as part of my application. I have quit my job so I do have time on my hands. Is this something feasible and any advice on how to approach this would be well appreciated.