Yes I agree there are many types of test out thereand DISC is one of them.
Unless you are stil in school or have access to some sort of organisation you will need to see visit a psychologist or counsellor who is trained to help you do a personality profile. They are trained to do the test and will interprete the results for you. So even if you did managed to get a copy of the test on line, you will be hard press to try and interprete the results. The charges can range from $50 to about $120 depending on who is doing the test.
It is a very useful thing to know about who you are and what you are like and what suits you your strengthens and weaknesses and from there what type of career is suitable. Oh, once you get the result be careful not to let others see it bec nasty people can actually use it to exploit you bec they know what you are weak at. Also if you are a couple, you can do the test to determine how compatible both of you are from a mental and psychological point of view and to spot where the potential problems may arise.
At the end of the day, the more you know and learn about yourself the better you will be to face tomorrow

take care