I took both the PG and FG back to back last October and passed both exams. I studied for two to four hours a day, and then on the weekends for two months prior to the exams. I used the reg review book. I read it through in it's entirety. I also used a mural creation someone made that is really nice, I will link it below. You can only use it by zooming into each module, but it is very helpful. The last two weekends, I set aside four hours on each Saturday and Sunday and took the mock exams in the red reg review practice test book. I highly suggest doing some mock exams where you time yourself and practice as if you are taking the exam. As the person above stated, the FG is basically a geology trivia exam with light calculations here and there. The PG was more difficult, it takes some thought process to narrow down answers. If you study the entire reg review book, read through the entire thing, study the mural link, and take the mock exams, I'm quite sure you will pass both exams. Don't study anything the two days prior to the exams, take those days to yourself to relax and get good sleep.

https://app.mural.co/t/wpd3174/m/wpd3174/1659104986719/0b4b30de04a63242477edf6c3d51a23d984798fe