I don't think they bother to adjust the scale for different tests, and the scores in the sciences seem to be somewhat inflated.
According to this scale on Kaplan FL-2, I scored a 36 (14 from PS with +67, 9 from VR with +49, 13 from BS with +64). Either that or Kaplan FL-2 is extremely easy. This exam's PS is the only PS that I manage to finish on time with high accuracy. On all the others, I'm forced to guess 30%-40% of the questions because there are too many tough passages to decipher within that time frame. Anyone else with similar experiences?