When I was studying for the DAT, I was working a full-time job (40 hours a week and sometimes overtime), and attending 2 classes after work (3 hours each per week, on top of assignments, midterms, and finals for the courses). My scores ended up being:
TS: 19
AA: 20
RC: 21
PAT: 23
It is difficult but it is do-able! This was a typical day (without school):
8 am - 4:30 pm : WORK
- I would get up at 7 am, make breakfast, pack lunch and drive to work.
- I had a one hour lunch break which I'd sometimes use to do a few PAT problem sets (because one hour isn't enough time to dedicate to learning bio or chem). This was often difficult though because co-workers always wanted to eat together and go out for lunch so I eventually gave up trying to do this and just used the hour to kick back and relax.
5 pm - 5:45 pm : RELAX & EAT
- I'd usually be home by 5 ish after work, and I'd eat a snack, watch tv or take a power nap. Whatever I needed to do to get in the mood to study.
5:45 - 8 pm: STUDY
- TIP: It helps HUGELY if you don't have to move around often to study. If you have one space in your house or room that's constantly set up for studying and you don't have to pack up and move your books every time you want to study, this will save you tons of time everyday! I strongly suggest this because at first, it was taking me about 15 minutes to get set up and start studying. Those minutes add up over time.
- I'd focus on one area during these two hours. Namely bio or chem (whatever I needed more help with) because you're likely more refreshed at this time than later in the evening.
8 - 8:30 pm: RELAX & EAT
- I'd eat again to re-fuel and watch a quick tv show. I tried to avoid lying in bed or getting too comfy because that would deter me from getting back up and studying.
8:30 - 10:30 pm: STUDY
- I'd use this time to do practice science questions or PAT.
- If the day felt too long and I was tired by this point already, I'd just review the concepts that I'd learned before or watch Chad's videos because it's not worth it to try and take in new info when you're in a tired state.
11 pm: SLEEP
- I'd usually be in bed about this time because I really need 8 hours of sleep to function.
Then wake up at 7 and do it again. Of course there were two days a week I couldn't do this because I had to commute to another city to attend class and then commute home after to get up and go to work. Weekends were my savior! I'd sleep in until 8:30, get up and do a practice PAT test, read a science journal article over breakfast, and then get started on a full day of studying.
Don't forget to leave yourself room for error and time to catch up if you fall behind. Sometimes you just need an evening or a whole day off, and that's okay. It's better to take some time to recuperate than burn yourself out and lose focus.
The most important thing though is your mental attitude towards studying. You have to find motivation in yourself and have a rise-and-shine attitude everyday because there just simply is no time to waste if you want to be a dentist. This next little bit of your life will be a structured routine. You will probably be anti-social, overworked, underfed, and eventually overtired. But it will all be worth it when you see your scores.
I hope this helps a bit and if you need more info, definitely ask! I'd be more than happy to help having been in your position not too long ago. GOOD LUCK!!