The number of misses a target score tolerates: roughly 0–2 RW and 0–1 Math errors for 1600, 3–5 and 2–3 for 1550, 6–8 and 4–5 for 1500. The distance from 1500 to 1600 is about ten questions out of ninety-eight — closed by destroying ten specific habits, not by learning new mathematics.