Take a spelling test and track your progress: Longer oi and oy words (CHARLIE).
In longer words, use oi in the middle of a syllable. Use oy at the end of a word or the end of a syllable.
"I have just subscribed and look forward to continuing to use Spellzone. I have been really impressed with the program during the trial period and the students gave very positive feedback. Many thanks."
Teacher, International School, Geneva