0815

Hello! I did my TOEFL yesterday with a, at least for me, astonishing result. I have read in the official TOEFL score calculating explanation at http://ftp.ets.org/pub/toefl/989551.pdf: "The maximum scale score on Structure is 13." So one would assume that the range to achieve in the total structure/writing score should be between 13 and 30. However, my result was 13-29. Is there anyone out there who can provide a explanation? Thanks in advance, 0815