SAT Reading: Natural and Social Science (Advanced Practice)

My daughter has started to do two of the readings, the paired reading. She says it's hard, which is good. If the reading was easy, she's wasting her time. My two kids like science and assume that the science reading is easy, but none of the SAT reading is easy. My son found that the PSAT he took to qualify for national merit last October had a science reading that was the hardest passage. I've found all these subject reading books for the SAT to be very helpful.