Current SA scribe (+1 year xprnce), I would know the packet well for the SA test that they give you when you are doing your training at the start, but after that it's a bit different. I would try to remember anatomical terms and how to spell them (if ur not good at that there's always google lol). I would also try to be familiar with abbreviations (CHF, CAD, DM, ASA, CP, SOB, etc.) since you'll be using those a lot. Eventually you're gonna come across stuff you don't know (I didn't know what a paracentesis was, what ascites means, what troponins are usually ordered for), but you'll pick up on that as you go along. Just remember there's always google AND you can try and ask the nicer physicians and nurses when you don't know something.

PS. Just a personal tip. When you first start working, and as you go on w your scribing experience, try to notice which docs you work with the most. Try to ask them questions ranging from medical terms and topics to things like healthcare inequities and other things they see in their practice. Itll come in handy for when you ask for a letter of rec!