When I was younger, and I had a word with the word 'city' in it, I kept spelling it aloud as S-I-T-Y, and when my dad asked me to write it out, I gave the correct spelling of C-I-T-Y. I also reverse letters, repeat letters, drop letters, and other reversals like the one mentioned above when I do it verbally, but when writing or taking a test, I just remembered how the word looked when it was on the spelling page.
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"There are things you need not know of, though you live and die in vain,
There are souls more sick of pleasure than you are sick of pain"
--G. K. Chesterton, The Aristocrat