How hard is it to become a doctor?

I'm in high school.
I am aware that it is very competitive but I will try my best and I won't give up nevertheless.

To be a doctor, do I have to take up chemistry, biology, physics, 4u maths (preferred) and advanced english for the HSC?

I usually get As in my reports and a few Bs. :(.

So how hard is it become a doctor?
 
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