Took the OAR today and figured I'd share everything I used to prepare in case it helps anyone else.
Score: 59
Studied: ~2 months -- first month a couple hours on the weekend + lots of time searching for relevant info and 2nd month at least an hour every day after work + more on the weekends. As a caveat I have been out of school for 7 years and my job has nothing to do with math or physics, so I had to re-learn basically all of the material for the math and mechanical sections.
If I were to do it over...
- I would start with a practice test to figure out the areas I needed to most help and then buy the relevant books. I overstudied some areas at first because I thought I needed to know way more physics than the practice tests included.
Overview of What to Study:
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https://www.med.navy.mil/sites/nmotc/nami/Pages/ASTBOverview.aspx
-- This was the best guideline of what to study that I found on the internet. And I'm pretty sure I searched the entire internet. Wish I had found this sooner.
Practice Tests:
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http://www.petersonspublishing.com/OfficerCandidate/
-- They will send you an access code via email. You only get one code and you can only take each section once. Once it's scored, you're done, so plan accordingly.
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http://www.nelnetsolutions.com/pdf/free/masterofficercandidate.pdf
-- There is a full practice test at the end of the book. You have to time yourself. They do a good job explaining the answers but some of the diagrams / answers were not correct.
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https://www.med.navy.mil/sites/nmotc/nami/Documents/ASTB_SampleQuestions_13May14.pdf
-- Not a full practice test but gives a good idea of how to gauge how hard the hard questions will be. Doesn't explain wrong answers but you can use the internet for that.
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https://www.triviumtestprep.com/astb-practice-test/
-- Not the best content wise, but I was worried about my timing so this helped with that.
Study Materials:
--Good explanations / step by step solutions and felt like this covered basically everything I needed to brush up on.
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https://www.proprofs.com/flashcards/topic/astb
-- There's a ton of content on here. Search by subject. A lot of it looks like it was directly from the Arco book
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http://www.petersonspublishing.com/OfficerCandidate/
-- This is a second link to the same Arco book from before. There's a mountain of practice Qs in here.
-- Patrick's study guide was REALLY helpful
Good luck