If I were you, I would NOT AT ALL bother myself with these test papers. I would ONLY stick to OG12 and OG Verbal for practice and learning. People say, for Quant
MGMAT guides are the best. For verbal concepts, I would refer to
MGMAT guides and Powerscore guides - I would study BOTH (I disagree when somebody says stick to only one of the two), as both have their own touch solving problems, what method suits one depends solely on his/her strengths and more importantly comfort; unless one studies both, how could one tell which one would fit his/her strength/comfort. Furthermore, for periodically evaluating myself, I would stick to
MGMAT CATs and, in the later part of the prep, GMATPrep.
I would highly recommend NOT to get distracted with ANYTHING ELSE!