Which courses should I take to become a psychologist (biology etc.)?
It all depends on the particular university or college that you go to. In my university, for instance, for my Psych major there were “required” courses, like Intro to Psych, Research Methods, and Statistics. But after that I could chose from whatever courses that were availiable, and the bigger your college/university is, the more selection there will be. From your question I can’t tell if you are still in high school, but if you are, yes, courses like biology will help because hopefully they will teach you a bit about the brain/eyes/ears, a little of which comes up in almost every psychology course you take in college. If your school has any social science courses you should take those too because they will give you bits and pieces of psychological theory, etc.