There are problems with the test and little to nothing showing that it really does provide test takers with any valuable information to base decisions on
http://en.wikipedia.org/wiki/Myers-Brigg...r#Validity (this section and the next two are relevant) So like so much of personality testing it ends up pretty useless on an individual level. Or hey, maybe you can reflect on your answers to these kinds of questions and get something from it. Just don't take the score all that seriously, you probably know yourself better already.
I'd also like to mention that personality testing as used by companies during interview procedures is, generally, a bad thing. The tests aren't so good that it's really hard to "cheat" on the tests - besides, I'm sure that the more popular they get, the more information will be spread about how to cheat on them. And there are huuuge problems with them being biased for natives, since linguistic difficulties influence answers. Moreover, people who aren't as sure of themselves might answer in a self-depreciating manner, giving off a overly negative image, and those who are overly confident will answer in a more exaggerating manner. The biggest issue with the tests is that, as far as I know, there hasn't been any randomized studies done in real situations, meaning the findings that are supposed to back up the usage of the tests aren't necessarily applicable to real-world interviews. Some companies also use intelligence tests, basing their decision on that studies have shown intelligence tests to predict a huge chunk of the variation in job performance. But within many areas, there is a much more limited range of intelligence test performance among the applicants (since those with higher education aren't randomly distributed on the intelligence curve, especially when you're talking eg building engineers) which means they probably predict much less of the variance in job performance. And with intelligence tests, language becomes an even bigger problem. So lolimmigrants. You can't be assured that there are no problems even if a psychologist is administrating the tests, because many psychologists aren't really aware of these potential and widespread issues.
So much of psychological testing is bullshit. A lot of it boils down to failure to acknowledge that psychologists DON'T know many things and that they are unable to do some things they wish they could do, in favor of exaggerating their competence to increase their "value". It's an abuse of authority and "expertise".