Based on the information you provided, you would be considered a second-year college student or a sophomore. An Associate of Science (AS) degree is typically a two-year degree, and you are now enrolling in your first semester for an Associate of Arts (AA) degree, which is also a two-year degree. This means you have completed two years of college-level coursework and are entering your third year.
However, it's important to note that some institutions may have different classifications for student levels, so it's always best to check with your specific college or university to confirm your status.