That's a huge task. Chemistry makes up 60/100 questions in the Science portion of the DAT. Organic chemistry is arguably one of the hardest, and most important portions of the DAT. I've heard from a dean himself that he considers the Organic score a section in itself, and a good score there is a huge deal..
That being said, it can be done. How hard are you willing to work? Are you going to put in 2 or so hours of chemistry every day, even after your regular classes?? You can do this, but you have to buckle up and hold on! Go for it!
I would start with Chad's videos. They are crash courses on parts of the DAT. He teaches everything within the scope of the DAT. There are outlines you download to take notes on, and quizzes after every video. Don't take these lessons lightly. Take them slow, write clear and concise notes. Put them in clear page protectors and build your own text book (that's what I did). Study your notes. Watch videos twice if need be. This is where you study and learn chemistry. Use other resources on parts Chad doesn't cover well. Remember it's meant to be a review, not a first time lecture.
After learning this, time to practice and apply! DAT Destroyer is essential. The chemistry sections are impeccable! Work through this book. Every question. Understand the question, answer, how to work it, and most importantly, why did he ask this question? EVERY question in this book teaches a lesson you should know for the DAT! There are detailed rationales with every answer explaining. He shows how to work, what to look for, and even what tricks to watch out for.
Sorry if that was lengthy, but with a task like you're talking about, you need all the info you can get!
Good Luck! Please feel free to contact me with any more questions or anything like that! You can do this. I loved chemistry, especially organic. It's a different way of thinking. It teaches you to think outside of the box and really helps your problem solving skills, which will help you out on every other part of the DAT.
--Gage (Current D1)