Improving the world is too lofty a goal for anyone as an individual. But with a level of organization it becomes possible to improve the nation and the world itself.
To start with, I would educate the young in a way different from what they are taught in class: scoring high in mathematics and science is not all about learning in life. They should pay equal attention to what is ongoing in the neighborhood, country and the world. Then they should try to analyze the developments focusing on how those developments affect their lives; how things are interrelated and how a person is connected to the society.
The next step would be the development of critical and creative faculty in those young people. With sustained efforts it is possible to help them read between the lines as the spoken or written words are often used to hide many more words and meanings today.
This would obviously help the young minds to both discover their own potentials and limitations and to rationally prioritize things in life including a proper choice of career. This will also help them optimize the use of tools and gadgets: why be lost in a social media site if 10 crucial news/views on world development can be read at the same time?
(Published as the part of 'How would you improve the world' assignment of guardianwitness. View the whole page here)