261A
Each test has a pass mark which must be reached, if you fail one test you do not get through. The percentage pass mark varies with each test. For example. I believe in Basic Checking the passmark is 66/80, so if you attempt 65 and get 65 correct you will fail.
I am assured that you cannot fail the personality test, it is purely for HR's benefit to work with the answers you give for any interview you get to.