How a Lesson Runs
You submit written work before each session. An essay, a precis, or a composition exercise depending on the stage.
Your trainer marks it against what the paper rewards and then the session is spent on the reasons behind the marks, not the marks themselves. Where the argument lost direction. Where a paragraph restated the previous one. Where the precis kept the author's examples instead of the author's point.
Then you rewrite part of it live, which is the step most candidates skip and the step that produces the improvement. Reading feedback changes very little. Rewriting under guidance changes a great deal.
Full timed papers are set at intervals so you practise the actual conditions rather than untimed work at home.