How do I determine my competitiveness for OCS?

Before you start thinking about beaches you need to get into OCS. Your competitiveness really depends on multiple factors because when selecting people for OCS, the boards look at the whole person. But there is no “test” to determine your competitiveness. Now, after you’re in OCS it’s a different story. Your branch will be assigned to you based on a preference sheet that you fill out, your standing on the OML (Order of Merit List) and the Cadre’s assessment of you. Bottom line, your performance in OCS determines your competitiveness for the various branches.

Honestly your biggest hurdle for getting into OCS will be your recruiter, because it takes more time and energy to get someone into the Army as an officer. But if that’s what you want to do then be persistent. And fact check what your recruiter is telling you (for example if they say something that makes you think WTF, bounce it off people here) because some of them will either stretch the truth or withhold some facts.