Your OAT Score
The OAT is given a scaled score of 200-400, 300 being the median representing the 50th percentile. Separate subscores are reported for biology, general chemistry, organic chemistry, reading comprehension, and quantitative reasoning.
Each question within a section is worth the same amount, and there's no penalty for guessing. That means you should always answer every question. Never let time run out on any section without selecting an answer choice for every question.
Your score report will tell you (and optometry schools) not only your scaled scores but also your percentile ranking. Students often ask: what's a good score? Much depends on the strength of the rest of your application (if your transcript is first-rate, the pressure to strut your stuff on the OAT isn't as intense) and on where you want to go to school (different schools have different score expectations).