Rank A missions are level 40-60 missions that Chunin can do. Rank A missions appear in the iOS version of Ninja Saga. Rank A missions first became available in the 1.1.13 version update.
There are currently ?? Rank A missions. After completing every Rank A mission at least once, the Jounin Exam becomes available for Level 60 Chunin. However, the Jounin Exam is currently not available in the iOS version of Ninja Saga yet.
List of Rank A missions