Question about books

I only took one year of DJS in high school. After the basic book (I had a Functional Method book) I was wondering if the next books Transcription, Dictation, and Speed Building have any new brief forms or other new "shortcuts" or are they just focused on transcribing properly and knowing proper punctuation and grammar and of course, building up speed.
I'm just wondering if I should buy the next books or not. Will I just be reading more boring business letters or will I be learning more advanced shorthand?

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