Only being 18 I may not have all that much experience but I would agree with people in improving your maths skills. By going to college to upgrade your GCSEs or via a private tutor. I had my maths up to Higher level in Scotland which is just below the equivalent A-Level. Now i'm at university doing Aeronautical Engineering and the first year maths is a third of our coursework and a fair bit is repition of what I have already been taught yet some material is new. However, the material that I have already seen is merely being enforced and as a result I gain a better understanding. I would suggest going down the route of upgrading your current qualifications.
