I’m taking it next year, but I’ve heard horror stories and I don’t know how hard it will be. I’m dividing up my school studying and DAT studying accordingly. How hard is the DAT and when should I start studying??
Also how do you study for PAT and RC? Is just DAT bootcamp enough?
Most people really do not recommend studying for the DAT for anything more than 6 months. You may drive yourself a bit crazy and end up exhausting all of the good resources there are out there. Many of the horror stories you've probably heard are from people that either didn't use the resources correctly or only stuck to blunt memorization without learning the material for real. Frankly, the DAT is hard, but there are much harder exams out there - so no need to panic!
If you really do want to start this early, I'd recommend focusing primarily on your classes right now and making sure to understand the information and get good grades. The DAT is one thing, but if you mess up once you can always retake. You can't fix your GPA once you receive your grades. I started prepping for biology a bit a year or so out from my DAT using the Orgoman Dynamite Biology Review because (1) it was free and (2) it was a great, comprehensive review of everything in the biology section. I read it leisurely the summer before and took some notes. This prepared me pretty well for the resources I used later down the line.
For now, I think that's all you should worry about practicing quite frankly. For PAT, you can find free generators for the different sections online. You could consider starting to work on those now, but don't worry too much yet. For RC, you should start reading scientific articles (or, honestly, anything at all) for at least half an hour to an hour per day. That section really just comes down to reading speed and comprehension, which can really be improved by regular reading.
Worry about purchasing prep materials when the time comes, maybe in 6 months or so. The combo that worked great for me (see my breakdown linked in my signature) was DAT Destroyer + Math Destroyer + PATBooster. Another SDN user, WithLove, also found great success with those too. Many other people have succeeded using these three paid resources. I found BC too expensive and outdated, personally.
Read through some of the breakdowns on here to decide what works best for you. The more detailed the breakdown the better a lot of the time. Otherwise, focus on your classes, and do some light review if you really are antsy about it.
Best of luck!