You should take all the AP tests you can, as long as you feel as though you can pass them. AP classes are huge at all the UCs. Not only do they look good on applications, but the UCs will give you credit for the course if you passed the exam with a 3 or higher. Pass enough AP exams, and you can effectively enter college as a sophomore, meaning one less year you have to pay for tuition. Definitely take AP Psych if you want to major in it. But remember that the only way you can do something in psychology is if you have a grad degree
On an unrelated note, you should probably clean up the grammar of your posts. I hate to be a grammar Nazi, but this is a forum about colleges. There are standards and expectations.
Hopefully I was helpful!