Did they give you a syllabus with a description of the class?
You've got to figure out where your passion is. Computing is such a general term.
You've got hardware specialists, software specialists, tech support, help desk, application programming, web design, web development, graphic art, information technology, networking, network security, etc. There are even some fake ones like SEO specialist.
When I was in high school our computing class taught us how to use microsoft word and excel and how to code enough HTML to make a geocities page. They should have called it introduction to receptionist 101, but it was an easy credit.