Per AP Chem Curriculum, the only memorizing of Solubility rules are :
Essential Knowledge - TRA-2.A.5, Precipitation reactions frequently involve mixing ions in aqueous solution to produce insoluble or sparingly soluble ionic compounds. All sodium, potassium, ammonium, and nitrate salts are soluble in water.
Rote Memorization of "Solubility Rules" other than those implied in TRA-2.A.5 (see above) will NOT be assessed on AP Exam.