It's only 28 questions, so it can't cover everything -- and some of the terminology it uses is a little outdated. Even so, it's interesting and useful and can be helpful even when your answers are uncertain.
If there are others with (un-dx'ed, self-dx'ed, pro-dx'ed, etc.) anxiety disorders, PTSD/CPTSD, BPD, DID, non-plural dissociative disorders, non-traumagenic plurality, autism, ADHD, etc. who want to check out their dissocation levels as a first step toward further exploration or as a confirmation of a diagnosis or just for fun, I recommend giving it a try. It shouldn't be taken as an official professional diagnosis or the final say on your experiences, but it might offer some perspective of some kind.