For the sake of the topic: I'm INTP-A, but there are many issues regarding the MBTI test.
The MBTI's accuracy rests on "honest self-reporting". But the MBTI ignores our propensity to respond to surveys in a way that is socially acceptable or that will make us feel good. It only provides a partial portrait of human nature. For instance, it ignores characteristics like emotional stability, which is also known as neuroticism and has been demonstrated to be a predictor of depressive and anxiety disorders.
More valid personality tests would be: The Revised NEO Personality Inventory, The Sixteen Personality Factor Questionnaire and The Big Five. You'll usually end up with the same result despite MBTI where it can vary drastically.