the cog test is not too bad except for the last test. If you go to aviationinterviews.com they have some great gouge on it. I wouldn't worry about it too much. There is also the personality test. (i.e. strongly disagree-strongly agree) Just be honest. The interview, to me, was the most important. go to the website i mentioned and think of some flying stories for each HR question.
Good luck!
Good luck!