Immediate Experience
Once the school is unlocked you can do the following trick to get Experience points immediately. Teacher lets you train your Citizens by enrolling them in school and after a set amount of time they will emerge with a decent amount of Experience. However, if you don't want to wait you can go upstairs to Scientist and ask her to move time forward an hour. Although this is a handy alternative to grinding for Experience it cannot be relied on as it will drain your funds.
More tricks, tips and cheats for this game are right here - Citizens of Earth cheats
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