A problem words spelling notebook is designed to help someone overcome spelling difficulties. It would likely contain:
* Lists of frequently misspelled words: The core of the notebook.
* Definitions of problem words: To understand the meaning and context.
* Sentences using the problem words: To see how the words are used.
* Mnemonics or tricks: To help remember the spelling.
What's least likely?
The answer is Word origins and etymology. While fascinating, this information isn't usually crucial for improving spelling proficiency. The focus is on practical application and remembering the correct spelling, not the historical development of the word.