Depressed about Uni Applications

So I finished my GCSEs with A*s As and Bs and one D due to my German teacher dying half way through and was then sent to this other school to do my A levels by my Father where I had to get up at 5 45 every day and walk 30 mins to a Bus stop then take a 30 min bus ride getting in an hour before school started, as a result I ended up with CDEU in Economics, Maths, Physics and Further Maths respectively. I chose to go to the local school and in retrospect I was extremely lazy, I took Maths, Further Maths, History and Physics this time and got BCCE, again as a result of not showing workings, being rushed with everything and not solving questions the way I was taught, despite getting correct answers. I have completely reformed my learning technique completely and study 3+ hours a night, not including Homework. My teachers want me to do 4 A levels as they think with changing my attitude to work I could achieve some good grades. Im aiming to re take some modules and get A*A*AA this year, two subjects of which dont use last years grades, I know this sounds completely biblical, but I am completely dedicating my after school hours to study, Im doing about 30 hours extra a week. I have work experience at Investment banks under my belt and trade Currencies as a hobby, however, if I want to get a job at a hedge fund or investment bank I need to go to a target Uni, and to be honest my grades are target Uni worthy. So I have finally come to realize that my teachers know better than I do about myself and am stuck in this loop hole where I will probably get rejected by most good unis on the basis of my AS grades. What do I do... I was told there is something called adjustment if you exceed your target grades?