> If the SAT is session-based, each session needs to be large enough that a single question can't tank the whole thing I think each session is either half or a

> If the SAT is session-based, each session needs to be large enough that a single question can't tank the whole thing I think each session is either half or a third of the test, for that subject. There could actually be more than two versions of the later session, to ensure that a student who makes a mistake or two isn't prevented from getting a relatively high score.