Hey, im sure that if you are thinking of doing medicine, you WON'T get below 3 D's!! I wNt to do medicine too, and am aiming for 5A's. So far, I have gotten A's in everything, but I did an S1(maths) past paper yesterday and got 11%[it was my first one] and the exam is NEXT WEEK. But still, I'm not going to give up, I WON'T ALLOW MYSELF to get 11%. There is still time, teach yourself EVERYTHING over the next few weeks. Ive literally spent every day in the library since April. Like ALL DAY. you can do it, and good luck!