TOEFLの受験回数制限

TOEFLの受験回数制限は月１回だけなんでしょうか？
GMATのように年５回といった他の制限はないのですかね？
HP上では
Repeating the Test
TOEFL policy states that you may take the computer-based test only once per calendar month, even if you took the test and canceled your scores. If you test more than once in a calendar month, your new scores will not be reported and your test fee will not be refunded. Violation of this policy may result in additional action being taken.
となっていますが。