Teach me by making me teach it back

I'm going to explain {{concept}} to you as if you were {{audience, e.g. a smart 15-year-old}}. Here's my explanation: {{paste}}.

Respond as follows:
1. Play the audience: ask the three questions they would genuinely ask, including the awkward one.
2. Diagnose my explanation — where did I use a term I didn't define, hide a gap behind jargon, or state a mechanism I don't actually understand? Quote the exact phrases.
3. Rate my understanding of each component: solid, shaky, or absent, with the evidence from my words.
4. For the shaky parts, don't explain them — give me the question to go answer, and where to look.
5. Show me the version of my explanation that keeps my structure but closes the gaps, so I can see the difference.
6. Give me the harder audience question to answer tomorrow.

Be direct about what I clearly don't understand. Politeness costs me learning.