Orgo was my worst course in undergrad so I dreaded this for the DAT. Somehow I managed a 28 on the OC section though.
This was 2.5 years ago so take my tips with the understanding that it's possible that the DAT content has changed since.
I went though Destroyer 3 times and tracked which questions I answered incorrectly each time. That way, I knew what I consistently did not know and topics I was iffy on. I also found Bootcamp to be really helpful. After 3 Bootcamp tests, the OC content became really repetitive. Ranking acids, naming conventions, basic reactions, etc. So I made sure I knew how to answer those types of questions that came up a lot and lo and behold, they were on my actual exam. Part of the beauty of GC, OC, and QR is that the types of questions become repetitive after a while whereas with bio it's the wild west.