At the risk of sounding cliche', just do work at something you enjoy. If you think there will be valuable knowledge in the degree certificates, go for them. If you have a cool idea you want to explore, go for it.
"Admission to the right university can make or break an ambitious young South Korean."I envy you actually; I never had a head for higher math and programming, my talents lie in hardware hacking and electronics repair. I'd love to learn some proper CS, but my life took a different track before college and now when I try to learn anything beyond bash scripting or simple microcontroller stuff in C, my mind turns to mush.