To me, practice is practice, but if you're that scared, don't do them. I don't think any prep company has the right grasp on verbal, not even EK itself. To me, EK is just excessively hard, but most people think it's the most accurate. You could always try a couple of passages from TBR and see. I don't think TBR can LOWER your score...not knowing what to do with the passages and questions is what will lower your score. TBR's poor question/answer choices can only boost your score and your confidence, IF you have the right strategy. That said, what you really need is strategy: a way to break down the questions to get the right answers and a way to get through all of the passages so that you don't find yourself with a whole bunch of questions unanswered. That way, it won't matter where you get your questions from because you'll be able to effectively analyze any type of passage/question type.