Ah the dreaded scheduling problems. Anki really should implement better solutions there.
I think for your specific case I have a solution for you:
select all notes that have not been studied yet (note: notes, not cards. Leave the third card-type for notes where you already studied at least one card-type out of this selection)
export these selected notes via Notes->Export Notes->Export Format: Notes in Plain Text
Delete these selected cards in your current anki deck
Reimport these cards via your exported text file. This will clump all card types together.
It really is a bit of a pain, but it should do the trick for you. Maybe look that the text file got exported in the correct order. The order of notes in this file will also be the same order you will come across these notes as new cards.
Does this procedure make sense to you? Let me know if I was not clear enough at points.