[Dwarf]

Much depends on what they require.
A work based situation may require an office -based person to be good at written work. A sales-based or management orientated person may need more speaking skills.

You must identify not only what they require as individuals but also their levels.
Mixed level is never a good idea.

A flexible one to one programme may be better. I have recently proposed rather than one session a week three but with shorter sessions to allow for work and progress.

What are the work requirements?