Before you tackle RP passages, items, and
sets, you’ll need to be familiar with a few distinct concepts. Mountains
of books have been written on the topics below; we’ve whittled them
down to their essential SAT-related core. We’ve also played a little
fast and loose with some concepts and names for the greater good
of simplicity and usability.
RP concepts are not as discrete as mathematical concepts.
Many of them blend into and depend upon one another. Don’t let this
discourage you: the main point is just to become familiar with these