The skill test and the psychological test are different. Skill test is required for skilled person for example if any one has applied for the post of driver he will be tested for driving, that driving test is skill test for drivers. As per Junior Auditor requirements the skill test for the said post is "Typing test" because 30 words per minutes were clearly mentioned in the advertisement.
For Psychological test I want to tell you first of all the meaning of Psychology.
Psychology is the science of mind, brain, and behavior. Psychological test means to test your mind, brain and behavior. It is hoped that you got your answers.