First year student Samuel Woo had been considering a career in cardiology so he would be able to pay off his medical school debt until the announcement this week of a generous donation that will remove tuition fees at his New York City school.Now, without the fear of crippling student debt, the 23-year-old whose parents emigrated from South Korea said Tuesday that he can afford to pursue his dream of providing medical services to people living on the streets.“I was definitely very…