Higher Education (Conclusion)

Lastly, you need to announce the grand opening of the High School for 13 hours.

Higher Education (Part 2)

Next you need to sit on a park bench inconspicuously for 2 minutes, reach level 2 at the Town Hall, call the Mayor for 3 minutes then make Caramel Slice, which takes 10 hours.

Higher Education

Now that you've got teenagers, they need to go to school.
This quest is untimed nor does it have any special rewards, other than the ability to build the high school and be able to earn money by sending your teens there.

First, you need to watch the news, then Call Mom and bake some muffins, have a Sim start a NEW career at the Town Hall and lastley spend 24 hours bribing ducks with caviar. That's as far as I've gotten.