In the KWL system, the "learned" phase refers to what you have gained or understood after engaging with the material. Among the strategies you've listed, the following would best fall under the "learned" step:
- Take notes.
- Highlight the important.
Both of these strategies involve actively recording information that you have understood or found significant after processing the material. Scanning for organization and considering prior knowledge are more related to the "know" and "want to know" phases respectively.