It awes me to see how
You already used a similar phrase in your first paragraph. Try not to repeat things like this too close together.
in a sensible region as the brain
I don't think "sensible" is the right word here . . .
I have suffered a number of setbacks during my preparation of my 4A levels. ...
This paragraph is unnecessary, as your transcript should tell the admissions officers most of this anyway. Also, shorter statements are better than longer ones, given how many they have to plow through.
Hmmmm . . . I see. The rest of your paragraphs are also pretty much irrelevant to your application, and read like a summary of your resume. I'm guessing you probably listed most of this elsewhere on your application, but even if you didn't, none of it really has any bearing on your ability to be a good medical student. I'd replace the second half of your essay with a discussion of what you hope to accomplish in the medical field.