The graph puts you on the steep line and everyone else below, so the click is about winning, not studying. A simple two-line chart carries the whole promise without a face. The title then names the tool and the exact number of prompts.
How the packaging works
Title
The title names the tool and promises five ready prompts.
Thumbnail
The two diverging lines show the viewer beating everyone else.
Remix this
When your topic is an advantage, draw it as two diverging lines with the viewer on the winning one. Label the lines you and everyone else so the comparison turns personal.