Another question I am asked about homeschooling is, "What about college?"
What about it? College is certainly an option for homeschoolers. Homeschoolers (on average) do better in a college environment than those who are traditionally schooled. Homeschooling is a lot of independent study, any way - much like college.
Another option homeschoolers have is taking college classes before graduating from high school. It is quite possible for a homeschooled student to have an Associates Degree by the age of 18. In fact, some online colleges will allow students as young as 14 to take courses! Graduating from high school early is not unusual, either.
Homeschoolers also keep a portfolio of work done. They usually take the SAT. They can take college entrance exams. All of these things help "prove" the academic ability of the student.