You learn computer languages in this program. You also learn spreadsheet and database software. It can be helpful to learn this software before you begin the program.
Business touches on all aspects of the culture, so you should take courses in non-business subjects. Good skills in writing, speaking, and critical thinking are needed for advancement in the business world. Remember that you will be communicating not just with computers and writing more than just code.
Some business courses in high school can be useful preparation for a career in management information systems. However, you should take only a few, so that your high school transcript shows that you are preparing for a demanding college-level program.