What are some good college courses that I can take now to enter college as a sophomore after I leave HS?

There is no magic number of AP exams you can take to start college as a sophomore. Every college has their own policy about AP credit. So while you might get a year of credit at one school, you might get 0 credits at another. Plus, starting as a sophomore doesn't really matter. Introductory level courses have students from all years. Plus, you may have to retake certain AP classes for your major, especially if you are a pre-professional (pre-med, pre-dental, pre-pharm, etc) major.