There is a difference between studying a subject and taking the exam. The subject may be fascinating, a school's busywork may be crushing, the exam may be fun. Since you are skipping the school's busy work, there may be only positives. You may wish to check in advance about the process and timing for scheduling your child to sit for the AP exam.
At some high schools, freshman may have the choice of taking world history or AP world history. US gov't, Human Geography, and Environmental Science may be other courses offered to high school freshmen. Regardless of what is offered in a school, students can and do study on their own to take AP exams.
