I am sure this has been addressed before but I have searched everywhere and really couldnt find the exact answer I am looking for.

I just started the Quant book, from GARP, and by page 20 I am already pretty lost. I understand the basic concepts covered up to that point (probability, basic stats) but do not feel comfortable with the material given I am a bit rusty at quant and GARP books provide very little explaining in terms of the formulas and numbers, which is my biggest concern.

I have seen a lot of people say that you don't have to be an expert at Quant to pass, a basic understanding of addition/subtraction/multiplication can get you through it. I find that VERY hard to believe. I am completely lost and would sincerely appreciate any help on this- recommending another study material provider (Bionic Turtle or Kaplan) , any YouTube videos, or additional resources are greatly appreciated.

Also, I assume you need to remember SOME formulas for the exam but what is the level of detail they will ask in the FRM ? Is it in the formulaic language in the GARP books?