The MMPI, or "Minnesota Multiphasic Personality Inventory," is a test used to assess mental health, and as such, it cannot be studied for. Diagnosis of a psychological condition can be very helpful, and should not be avoided.
This test was developed for use with adults at the University of Minnesota, and published in 1943. Since then, it has been updated, and a version for adolescents came out in 1992. It is the most widely used standardized test of adult personality and psychopathology, and the most recent version as of 2008 contained 338 "true or false" questions.
The test can only be administered and interpreted by a qualified professional. The professional takes into account the person's history, current situation and any psychological concerns. The MMPI is used in a number of contexts, including clinical settings, forensic investigations and employment screening. It is also a powerful tool for psychologists who are coming up with a treatment plan for a patient.
The MMPI has 10 scales to assess 10 different abnormal behaviors. Those behaviors are hypochondriasis, depression, hysteria, psychopathic deviation, masculinity and femininity, paranoia, psychasthenia (obsessive tendencies), schizophrenia, hypomania and social introversion. Additionally, there are four different validity scales to evaluate whether the person being tested is taking an honest approach with the test answers.