Personality Tests

I just took a personality test and I got this as my result:

You are a Persuader, possible professions include - entertainer, recruiter, artist, newscaster, writer/journalist, recreation director, librarian, facilitator, politician, psychologist, housing director, career counselor, sales trainer, travel agent, program designer, corporate/team trainer, child welfare worker, social worker (elderly services), interpreter/translator, occupational therapist, executive

I'm glad psychologist made the list because that's the career I want in the future. Anyway, I'm really curious how these personality tests work and how they can be so accurate. I remember taking the same test a few months ago and getting the same results. I also took a color quiz which makes you click on colors you are most drawn too and the results were shocking...it really read my mind and told me exactly how I was feeling.