You may want to check with your school district and local community college about dual enrollment options. In our district, it is very common for kids to take courses at the community college while continuing at the high school for some electives and "specials", like music, PE, art, and drama. There is a well-developed procedure in place, and there are several different options for students, ranging from taking college-level work in only one or two advanced areas of special interest, to taking the entire core curriculum at the college level while earning concurrent high school and college credit, so that they graduate from high school and earn an AA simultaneously.