CREATE TABLE table_68998 ("Name" TEXT, "Years" TEXT, "Gender" TEXT, "Area" TEXT, "Authority" TEXT, "Decile" FLOAT, "Roll" FLOAT)

Name the highest roll for coed and authority of state integrated with sacred heart school
SELECT MAX("Roll") FROM table_68998 WHERE "Gender" = 'coed' AND "Authority" = 'state integrated' AND "Name" = 'sacred heart school'
SELECT MAX("Roll") FROM "table_68998" WHERE "Authority" = 'state integrated' AND "Gender" = 'coed' AND "Name" = 'sacred heart school'