QM: Readings 8 & 9

I’ve read readings 8 & 9 at least twice and I don’t know if it’s the way it reads or what but I’m having a hard time with these two readings. I don’t have Schweser or Stalla, I opted for AN because it was cheaper. Anywho, AN explains it the way it was explained in undergrad, with dice and decks of cards. Maybe I’m looking at it the wrong way. Does anyone have any tips for studying these two readings or does anyone know of any websites I can visit to do more probability practice problems? I need the practice because as we all know QM is a big subject.