I used Chad's videos on his own website, the ones that have been more recently updated. The orgo videos were updated last year, and the gen chem videos a few years earlier. The entire video series is free, and he teaches you about 90-95% of what you need for the DAT. Here’s the YouTube link:
Chad's Prep
You can also go to
chadsprep.com and make a free account. If you go to the ‘basic’ organic chemistry/general chemistry course you can also see all of the videos for free, it’s a bit more organized than a YouTube playlist. The only thing you have to pay for is the questions if you want them, last time I checked they were $10 per month for both gen Chem and Orgo combined.
Taking notes from the updated videos was enough when combined with the Bootcamp questions for me to score well.
edit: I should note that the videos were not specifically made for the DAT but they are probably the best free resource for the DAT. I used them to learn the vast majority of the material for OC and GC, and supplemented the videos with BC questions.