I'm not sure what 'two' you're talking about. Psychology or psychiatry? You'll need a PhD or PsyD to be a psychologist (4 years of undergrad major in psychology and 4-8 years of grad school at another university) or an MD for a psychiatrist (major in psychology and take the premed courses, then another 4 years for med school, then 5 years of residency before you can get a job). The top schools for psychology include Stanford, Berkeley, UCLA, and the University of Michigan. You can do the premed classes anywhere.