CREATE TABLE table_19433 ("School Year" TEXT, "Class A" TEXT, "Class AA" TEXT, "Class AAA" TEXT, "Class AAAA" TEXT, "Class AAAAA" TEXT)

Who was the Class A winner in 2006-07?
SELECT "Class A" FROM table_19433 WHERE "School Year" = '2006-07'
SELECT "Class A" FROM "table_19433" WHERE "School Year" = '2006-07'