How the education can make person a good citizen?

Education helps people become good citizens for many reasons.

It gives them options. Many people find something they have an affinity for or are passionate about while exploring in school. Getting an education also greatly increases opportunities for employment. Options mean people will be less inclined to make bad choices, when they have a good opportunity.

It helps people understand each other. They key to a productive society (on local, national, and global scale) is understanding one another, which enables us all to respect each other. Education provides information about people and processes around the world, making it easier for people to relate to others that are "different" and to see them as fellow humans. When we see each other as fellow humans, rather than "the others" or some other categorization, people behave much better.