Read this blog to learn about Spelling Test Generator:

• Spelling is taken very seriously in many schools. Spelling Bee contests are quite popular in US and many other countries.
• Use this app to generate your own spelling tests from text books or any other printed material. 
• Use your phone camera to snap a book, page or any text.
• Set the difficulty level to number of letters in the words you want to test on.
• Go through the test and check your spellings against the word sound.

Available on iOS Store