Preparing for college in HS?

I'm a sophmore in high school... not normal high school though I attend keystone national high school. (I'm 16) I was wondering if anyone has suggestions on what I should be doing to prepare for college? I am going to have 4 years of foreign language, math, science, language arts, social sciences, etc. But I was wondering about any other things that could be helpful. I'm looking at Southwestern University in Georgetown Texas or UMHB in Belton Texas. To Become a nurse. Any and all advice welcome, Thanks :)