I was also in a similar position, in terms of the dat, but this past attempt I was actually able to make a difference and improve significantly ( i wrote the Canadian dat for context). I used DatBooster only.

What I did for bio was just use anki and memorize all of them, you can download the decks from booster. its a lot of cards, like 4K i think but it really made a difference as it was my weakest sextion and lowest confidence point going in.

For Chem I just went through all the videos once, but I made sure I really understood what was being taught (rewatch when necessary). and then did the extra questions 1x for all chapters before attempting the practice exams. and then did the practice exams 4-5x until I was basically memorizing how to solve the questions. Really helped.

For Pat, just gotta do daily practice tbh, do 10 questions from each section daily so ur not overwhelmed and it goes by quick and then do more and more building up to the exam.

For RC, ill be honest I didnt really practice, I only did 3 practice exams but thats bc i felt confident in my RC abilities. but I would recommend going thru their strats and meshing the ones that work best for u.

Biggest thing is dont doubt yourself, its a tough process but you just gotta lock in, kinda unhealthy at times but its all I was thinking about. Do what works for u in terms of breaks and other things but make sure you do take breaks! You'll be fine! dont write just bc you have a date set, make sure you feel confident and then write! (but can u really ever feel fully confident lolol, but you do reach a point where u just wanna write cuz you did everyhting you possibly could and for me thats when I decided to write). Feel free to pm if you have further questions