harold ekeh , 18 , was editor of his student paper and ceo of the model un .
celebrated being accepted to 13 colleges with a chipotle burrito bowl .
moved from nigeria to long island at the age of eight , got 2270 in his sats .
credits his success to his parents ' resilience and positivity .
he is leaning toward yale , has until may 1 to decide .
plans to be a neurosurgeon to find alzheimer 's cure for his grandmother .