CREATE TABLE table_23356 ("School" TEXT, "City / Town" TEXT, "Website" TEXT, "Size" FLOAT, "Principal" TEXT, "Grades" TEXT, "IDOE Profile" TEXT)

What are the grades served at Manchester Junior-Senior High School?
SELECT "Grades" FROM table_23356 WHERE "School" = 'Manchester Junior-Senior High School'
SELECT "Grades" FROM "table_23356" WHERE "School" = 'Manchester Junior-Senior High School'