is
it's
why I couldn't get the new Barbie in the market
why I couldn't get the latest Barbie doll (that saves you a couple of words!)
to reuse the last year sport shoes.
to reuse last year's sport shoes (what! you change your shoes every year? How is that poor? I suggest you come up with a better example of poverty lol)
in the interior
not sure what you mean
When standing on the stage, praising the seventh place we had gotten
Standing on the stage, being praised for the seventh place my team got, I...
"the size of our dreams is the size of our achievements".
this quote is awkward...you simply repeat what you wrote before. So I'd take the sentence "I am here because I dreamt high", or this one.
Now, I dream the biggest
now, I dream being the greatest? what you have here doesn't make sense.
I dream about the highest education, come back to my country and contribute somehow to make it a better place.
I suggest you take out the dream biggest part and simply put this:
Now, I dream about getting the highest education so that I could come back to my country and contribute (somehow? Say HOW!!! with my future math knowledge?) to make it a better place.
Overall, it's a completely different essay, and I do praise you for your persistence.
However, the theme of your new essay is unclear.
you first talk about poverty, then how hard work = compensation, then how you are influence by this philosophy and went all out for math, and finally, how you should dream big. Although it answers the prompt, I feel that it needs better connections between ideas.
Find your main point. Whether it's your dad's philosophy of hard work, or your view to dream big, you need to write the rest of your essay according to it. it just needs a few minor structural changes.