I am a non- native speaker and I got a 21 in the reading comprehension part. I however, did not follow Kaplan's technique of skimming and jotting down notes. I just read the entire passage, took no notes, and answered the questions as they came. Mind you, I did not study for the verbal section at all during my entire time studying for the DAT. I found out that comprehensive reading is alot more effective than skimming. Comprehensive reading might take more time, but you remember exactly where the answer to each question is on the passage. You should try it because when I was using the skimming thechniques, I could not get above a 17 on the full length exams. I have been in the US for 14 years.