I remember this test from way back in my college days. It was used as a career test to help you determine what type of jobs/careers would best fit your type. There were two books at the central library in Philly - one for taking the test to determine your code, and the other that listed potential jobs/careers linked with all the possible combination of codes (e.g., ENTJ, ISFP, etc.).
I also remember taking the test at the time, and ended up with a four-letter code that had .................................... ready for this, now ? .............................. NO jobs/careers connected to it! I think it was the only four-letter combo (INFJ) that came up zippo.
Boy, did I feel screwed.
They've since "adjusted" the second book to list careers. The website goes into further detail. Pretty interesting, though. I didn't need to take the test on-line. Oh, I remember my past results vividly.
What were my results? I'm an "INFJ - The Confidant":
"INFJs, making up an estimated 1% of all people, are the most rare type (males even more so). They are introspective, caring, sensitive, gentle and complex people that strive for peace and derive satisfaction from helping others. INFJs are highly intuitive, empathetic and dedicated listeners. These traits tend to act as a "tell me what's wrong" sign on their forehead, hence the nicknames Confidant, Counselor or Empath. INFJs are intensely private and deeply committed to their beliefs."
This link reveals some very interesting things about this type... it's almost dead-on. Here's a link to get to this second website's detailed profile for all 16 types.
WARNING: Ignore the bogus "ennegram" nonsense in that last link. Only the Myers-Briggs stuff is legit.