Thank you @"AlexDivine" and @"Cant Get Right" for your suggestions. Ill see to it to purchase that book to read it. And I'm planning to just redo the passages for the sake of practice and mastering the skill of identifying reasoning structure!
@"AlexDivine" Yea, I don't really like their erasers either. That's why I first though of "breaking them in". Then, I thought about the wearing them down to a point thing. I haven't tried it out during a real PT yet but I'll let you know!
Don't take any PTs until you've finished the curriculum. A few of the Mentors here seem to be really good at answering this question... (*ahem* @"Cant Get Right" and @"AlexDivine").