I got just over 50% on the first test and just under 50% on the second one. But then, I have an undergraduate degree in linguistics, after all. (There were a few that I got wrong and then kicked myself over.) I haven't had time to take the third one yet.
Klingon, like Tengwar, is an "invented" language of some standing at this point. There are dictionaries, classes, etc. (I got both of those right.)
If you find this sort of thing interesting, you might check
http://www.omniglot.com/ and particularly this page:
http://www.omniglot.com/writing/cons...2.htm#conlangs or
http://www.omniglot.com/writing/fictional.php