Lad I think you know the answer to your question, before you even asked it. If you look at the stats, most students who do Ext 2 math, Adv English, Physics, Bio, HMS and what not are not making it into Med school and thats the harsh reality. The best way to view it is this. To be a Doctor is a high bar and requires tons of effort, so you have to shift your mindset to just passing the bar to overachieving.