Alevels and Asthma

Hi, im kinda hoping someone here can help me as im running out of options. Since Christmas I have had 9 attacks that have required me to be hospitalized im on Steroid tablets, and on a nebulizer every day for prevention im slowly loosing hope that this will get better. I have my A levels coming up and i really dont want to be ill during exam season I would be grateful if anyone has any suggestions for me. I have no pets at home and I have pretty much eliminated all triggers at home i have the attacks when im out at school or shopping. Thankyou for any advice.