Hello @mpm ! I was a year removed from Orgo when I started preparing for the DAT, and while that may not sound like much, once I finished the course I tried to never think about Orgo again and forgot a lot of it when I began studying again. I found that DAT Destroyer is very, very useful for preparing yourself for any type of question that can be thrown at you on the DAT. It is very challenging and I would definitely go through it 2-3 times, but it prepares you very well and your scores will go up after going through it. However, since you are a bit removed and may want to refresh a bit, Chad's videos are great for learning/refreshing. Watch those once or twice, do the quizzes, and you'll be right back in it.
Once you're done preparing for just orgo with those resources, I would do the DAT Bootcamp practice tests since those are similar to what you will see on Test Day (the questions are even a little bit more difficult). Best of luck with your studies and let me know if you have an questions along the way!