C. turns 15 at the end of the summer; his "spelling age" today is
portmanteau (almost got that one - !)
Since I have nothing to compare this to (how would most American 14 year-olds fare on this test?) I'm declaring this a 'perfectly acceptable' performance.
'Perfectly acceptable' meaning: I'm thinking by the time C. graduates high school he will easily have reached Spelling Age 15, which is 100% correct.
The good news: all of his misspellings were phonetically correct, if phonetically correct is the term I'm looking for, which I'm not sure it is. e.g.: He spelled "amateur" amature. That kind of thing.
He starts an intensive 3-year French sequence in the fall, so that should help.
Lousia Moats on the English writing system
In addition, the English writing system reveals the history of the English language. For example, ch pronounced as /ch/, as in chair or chief, appears in Anglo-Saxon or Old English words; the same letter combination ch pronounced as /sh/, as in chef and chauffeur, appears in French words of Latin origin; and ch pronounced as /k/, as in ache and orchid, appears in words borrowed from Greek. Approximately 20 percent to 25 percent of English words are of Anglo-Saxon origin and about 60 percent are of Latin origin (of which 50 percent are directly from Latin and another 10 percent are from Latin through French, as in chef and chauffeur). The
remaining 15 to 20 percent of English words are primarily of Greek origin.
How Words Cast Their Spell by Louisa Moats
American Educator - Winter 2008-2009, pp. 6-16 & 42-43
* posted at the Reading Reform Foundation
** simple arithmetic eludes me (thank you, Michael Weiss) - and, yes, the formula is weird - not sure quite what's to the right of the decimal point