There is another way, Jeppesen run an online examination that can be monitored by a flying organisation either on airport or in town.
I did mine a couple of years ago, straight level 6 pass. A colleague who attended with me managed a level 5, and more interestingly a mutual friend who is a Training Captain with the National airline also only managed a level 5.
The examination subject is "Aviation English", it is not not an examination on English grammer or Shakespeares Sonnets.
The idea is to test your capability to communicate, understand and respond to aviation situations met by all pilots at sometime in their flying career using standard English Aviation Phraseology.
I have a theory on how the online system is scored which relates to the repetitive use of the word 'Rhubarb".
Not proven, but I did get a 6 (which is better than a High Five)
I'll post details of the Jeppesen test after reference to my records.