CREATE TABLE table_36555 ("School Year" CLOB, "Class A" CLOB, "Class AA" CLOB, "Class AAA" CLOB, "Class AAAA" CLOB, "Class AAAAA" CLOB)

what AAA class has a school year of 1989-90?
SELECT "Class AAA" FROM table_36555 WHERE "School Year" = '1989-90'
SELECT "Class AAA" FROM "table_36555" WHERE "School Year" = '1989-90'