Courses in science, math, English, history, social studies, and a foreign language are important. Science and math are particularly important because they provide the necessary skills for research and analysis in college psychology courses. Some high schools offer a course in psychology, which can give you an overview of what the field is about. You can also find a volunteer job where psychologists work, or read about psychology in newspapers and magazines to explore the field. Do not be misguided, however, by popular stereotypes of the field.
Psychology is a broad behavioral science with many applications.
The reason for this is that taking these classes will greatly help you in your upper level courses, and is a pre-requisite for doing independent studies, and research. It is very difficult to say when some classes will be offered, as things can change quickly. That means that you should try to plan ahead of time, and take classes that are offered seldom when they are offered. You never know when they are going to be offered again. Also, if you find yourself in lack of a class that you have to have to graduate, petition at the Records Office to substitute the class for another, but do it in ample time before you are due to graduate.