Yeah. You need to study so that way you have the skills and knowledge they're trying to teach you. With that knowledge you can

Literature class: write decently well, interpret themes, messages, and intent in media, engage in critical thinking and use it to present an argument for your position, understand that other people have their own perspectives and be able to entertain those perspectives

Math: think logically, understand relationships with numbers, understand the basics of how spacial dimensions interact, do all the minimum necessary math associated with citizenship as well as more that is likely to come up at some point in your life with at least the understanding required to pick it up again quickly after looking it up

Science: basic understanding of how the physical world works so that when topics of science come up you have some framework with which to approach it, an understanding of the scientific method and the philosophy of empiricism (these are often taught very poorly ime), an understanding of how physical objects in this world interact with each other and the basics of what makes machines do things and why

History: an understanding of what has happened before, trends and ideas from the past and their consequences, you're supposed to learn from it not take it as an instruction guide, an understanding of how the world and society got to be like this, basic understanding of various philosophies of governance and ways the world has been viewed

Government: as a citizen of a democracy you're going to be given a share in its ownership when you reach the age of majority, you really should understand how it works and have a basic sense of your duties and the reasons for them as well as how the law works

Foreign language: it's just useful ok, and the second language is the hardest