I was homeschooled for the last 6 years of my primary education. I'm regularly, on the President's List at the community college I'm attending before I transfer to a University to study Electrical Engineering.
However, I believe this is despite my homeschooling, not because of it. My parents didn't do much to improve or accelerate my learning, in fact, it was basically my responsibility to teach myself and prepare my own lessons in that time period. My mother did try to use field service as a "class," one which I didn't much enjoy.
For my high school years, I was given a Penn Foster Curriculum which was incredibly simplistic and didn't challenge me at all. When I did finally start college (of my own initiative and without much help from my parents) I had a lot of acclimating to do. The first thing I had to work on was my math skills, my arithmetic was nearly flawless (which I had learned well in public school), but the algebra that I attempted to teach myself was severely lacking for any college-level course, so I had to go back and relearn most of it
Two years later I'm finally at the upper levels of Calculus and will soon move to Differential Equations. I'm on track to achieve my goals now, but homeschooling definitely set me back.