More then anything in the world I wish to live life to its full potential by continuously building my knowledge, and challenging myself intellectually.
This is a vague sentence. Since you started the response with mathematics, I think it would be better if you stick with mathematics only.
The second response is good.
Same goes for third.
As the oldest child I have had to sacrifice many financial aspects for my siblings.
"Financial aspects" sounds awkward. Can you think of a different phrase?
When looking at my academic performance it is important that you remember the fact that English is my second language and that I have struggles with dyslexia my entire life.
I think you can condense this sentence. Also, it would be better if you don't use the second person.