First, thank you for your willingness and interest to serve. With regard to your comment about trying really hard to not drop below (a 3.0 GPA). real talk - be careful what you are planning for here. I'd change your goal to commit to improve your GPA and shine, not "try" to maintain. I'm the parent of a student naval aviator, and I'll share this - Navy aviation has a culture of excellence - those that I've seen in flight school, well nearly all, are highly motivated, come prepared, and the ones I know were prior rock stars at college. They are not trying to maintain a 3.0 - many are doing what it takes to graduate with honors/ deans list etc. Join them in that performance level now.
I have no knowledge of the OCS selection process for SNAs (pilots) but others in the know state it's highly competitive. I would look beyond selection only, and prepare for that flight school environment. Challenge yourself to get top grades in your remaining college time. don't try (really hard) - instead, do. As a good friend of mine from Bangalore says "Do the needful". get it done, make it a top priority. because there is a high volume of new material you'll need to learn that comes at you fast in flight school week after week (nife, primary etc.) and your peers for the most part (some don't make it) will be acing most tests that are put before them. Attrition happens, not all who start make it. Help yourself by raising your bar now.
Good luck to you.