Are these exams even strong predictors of how one will do on the real deal? I've heard they are pretty weak predictors but that's just hearsay. Spend the next 3 weeks honing in on your weak points and pumping out as many questions as possible. Any way you can delay to increase your dedicated time period? That may be the best option.
Yes: take them all. The more familiar you are with the test the better you will do. Although they are recycled questions and likely have some flaw associated, they are a good example of the structure and style of the questions you'll see on exam day.
Any tips on my last month of studying? I only took one comsae (form d) and scored a 496.. Im trying to get above 550 and any tips would be greatly appreciated!