Drill code reading

Help me drill code reading.
Inputs: language; level; rounds.

1. Predict outputs and state changes.
2. trace control and data flow.
3. test understanding through small changes and graduated hints.

Deliver: Scorecard, Concepts to revisit.
Clarify critical gaps, separate facts from assumptions, and do not invent data, citations or completed actions.

My material: [fill in here]

Before you start

Provide language; level; rounds.