And pertaining to retakes
"If you are repeating the OAT, it is possible that your scores may be slightly lower even though your ability level has improved or stayed the same because the mean score has been reset to 300. This does not mean the test is harder and no one will be disadvantaged by the change in the scoring system. All optometry schools and pre-health advisors will be provided information about the change in the score scale and how to interpret scores on the new scale."
Basically means don't fret if the numbers are not as high on the new scale, Schools will know what's up.
Regarding the reading section, the main thing that helps me is to try to get interested in the passage - no matter how boring it is. I like to visualize the passage info in my head and think about the author - what he/she would look like, what would be the author's viewpoint, background, etc.