What the official listing confirms
The official page says money can be earned through grades and side activities, but does not publish a fixed best-money route.
Use this as a controlled first-session test
Use the visible reward in the current build. Record one activity at a time and avoid mixing story progress with repeatable income.
- Name the activity
- Record the grade requirement
- Track in-game time
- Record the reward
- Compare one alternative
Keep the answer current
Agefield High: Rock the School is in its launch window. Verify patch-sensitive values in the current build and record the date before treating a route, build, or requirement as permanent.