I am using the same technik, do the test from the cd rom once, looked at the wrong questions, then did the test and I scored between 80-100% after sending the answers by e-mail.
the first scores were around 50-60%, ouch!
worked every day a little, sometimes 30minutes, sometimes 2 or 4 hours.Depend of wether, girlfriends and beers
(it is very important to understand,and not just to know what to answer in the questions,I have paid a fortune for this course, so my goal is to understand first)
I do not think I am more stupid than anybody else, If you take the effort and use your brain a little, I am sure you will do fine.
My school: Bristol