Realize which sound is more relevant in a given context (whichever that might be)
Which are the elements of difficulty the phoneme has for your potential students
Decide at the end, which sound you need to focus on first and so on.
The evaluation will be focused on:
The amount and accuracy of evidence you can muster
Its coherence with the context you present.
How the oral is organized in terms of timing and balance between the members of the group
Language as described in the oral descriptors in the official program.
References made to the assigned texts
How much fun you have
three pages one for each sound would be enough following the same pattern