What should you study in high school or college if you want to become a docter?

I'm not really sure but I think you need alot of maths & sciences.

Try to take the highest mathematic course you possibly can. Science courses such as Biology, chemistry, physics, anatomy & physiology are also great benefits to medicine.

It depends on the specialization of the one becoming a doctor. In high school, you should study every course to be qualified in a good university.