In addition to running NPCs, they should go ahead and plan out a testing schedule. For schools listed, I would plan on at minimum the math 2 in addition to the bio already taken. I would take the physics subject test if at all possible. I would also take the regular test fairly soon so that if more than 1 attempt is needed, there is breathing room to add in another testing time. If taking multiple APs in May, the May/June testing dates really stink for the regular test and are better for subject tests.