First off you're not dumb, anyone who tries to attack this crazy exam and doesn't give up is already smart.
One thing you should try is getting Kaplans Qbank, it's $200 and well worth the money. Since everyone on this forum agrees that Kaplans CATs are the most challenging then in using the Qbank, which provides exam like questions would be a great benefit to your study regime.
When I say exam like questions, I don't mean some fluffy questions. I mean questions that will put you through your mental paces. One of the best things about it is you can curtail it to your needs.
What that means is if you want to do 50 geo & algebra then you can. If you want to do just modifiers and strengthen questions, fine. Alot of the questions will compliment what you're doing in the
OG. Also the Qbank keeps the
error log for you and then gives you a detailed report of what you've done total and for that particular quiz.
One thing you might want to try is cross refrencing your
OG error log with Qbank reports and then you will see that score sky rocket, by then you should really be able to hone in on your weak areas.
Kaplan has retooled their CATs to supposedly look like the real thing, whether they do or not, I'll let you guys know when I take the exam. One other source you might want to try is
Manhattan GMAT. Their study manuals are pretty detailed, with the exception of CR & RC.
They list all the
OG problems by category. For me it saved time, because in the assignment lists, they tell you which problems they consider to be the most challenging.
Anyway keep you chin up and if you have any other questions, email me.
P.S. I don't work for Kaplan or
Manhattan GMAT