calculating prodigy?. Many idiot savants has this useful gift. Most people who have this strange ability had it from birth, including the great mathemations: Euler, Gauss, Wallis, von Neumann.... But whether a person can train himself how to do this is an interesting question. Histroy records only one such person.
I say that your victory is unlikey. You may get fast but you will never be faster than these guys, spend thy time on something else.