Not directly related to medicine, but I advise every high schooler and undergrad that I mentor to take as much math and/or computer science as they can if they are interested in biology or neuroscience (or to major in physics). There are not going to be PhD level jobs given out for graduate work that was essentially being a lab tech for 6 years, no matter how much cheap labor current professors need/want. That said, I also tell them that if they want to be successful they need to read and understand most of Molecular Biology of the Cell because it is the foundation for understanding the fundamental parts of biological systems.