CREATE TABLE table_68111 ("Name" TEXT, "Years" TEXT, "Gender" TEXT, "Area" TEXT, "Authority" TEXT, "Decile" FLOAT, "Roll" FLOAT)

What is the highest decile of Tarras school, which had a state authority?
SELECT MAX("Decile") FROM table_68111 WHERE "Authority" = 'state' AND "Name" = 'tarras school'
SELECT MAX("Decile") FROM "table_68111" WHERE "Authority" = 'state' AND "Name" = 'tarras school'