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You need 3 years of high school science to attend a selective college.
The requirements for high school preparation in science vary greatly from school to school. In general, the strongest applicants have taken biology, physics, and chemistry. It's recommended to take at least, two, if not all three of these courses, as they provide a strong general foundation for college-level STEM classes. In addition, it's also important to attend courses that include a lab because many colleges stipulate that high school science classes must have a laboratory component in order to fulfill their science requirements. This is especially important for students hoping to pursue a degree in fields such as engineering or one of the natural sciences.