I have all the EK books and have been studying using them as well. I really like them better than anything else I have looked at. I hadn't seen the home syllabus - I need to check that out!
I think that you have to give yourself some grace when considering your scores taken at that time of night.

That said, I would find a way to get some chances to do some testing when you aren't kind of brain-fried.
I'm not sure of how you feel after you go over things, but I know that I will go "Oh, I really need to review that concept." Like Melbelle, I have a notebook where I am writing the things that I really need to go over again and/or memorize. In some cases, I need to go back to my textbook and read a little more or see more pictures and that helps me remember better, too.
My last theory regarding the EK stuff, and why I am using it, is that all the questions allow me to make some stupid mistakes that hopefully I won't make on the real test. I tend to learn that way - I went through most every question in my chem textbooks. I have the 1001 Questions books, too. I love having all the questions.
Hope that helps a little and it is good to know others are in the same spot!