user: Question: What is the highest decile of Tarras School, which had a State authority?
Columns: ['Name', 'Years', 'Gender', 'Area', 'Authority', 'Decile', 'Roll']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'real']
Sample row: ['Alexandra School', '1–8', 'Coed', 'Alexandra', 'State', 8.0, 194.0]
SQL:

assistant: SELECT MAX("Decile") FROM "Table" WHERE "Authority" = 'State' AND "Name" = 'Tarras School';