According to Wikipedia, "Political science is the scientific study of politics. It is a social science dealing with systems of governance and power, and the analysis of political activities, political thought, political behavior, and associated constitutions and laws."
Political science is about the government. Political science helps us to build a better government and policies.
Wikiversity is a Wikimedia Foundation project devoted to learning resources, learning projects, and research for use in all levels, types, and styles of education from pre-school to university, including professional training and informal learning.
There are lots of self-learning contents about political science, which you can study by yourself before going into a formal education.
There are some interesting topics that you may have a look: