DS attended PS for 7 years. He did well before we moved, but starting in 3rd grade we had nothing but problems with the school. After fighting with them for 3 yrs (they insisted DS had ADD, the Ped. ruled it out) I started digging into the schools record. What I found was shocking. This ele. school had a very high % of kids who qualified for special Ed or remedial help (the last report, from 2001-2002 is 61.4%). I spoke to parents of children who were then attending the local middle school. Honor students from our Ele were way behind in middle school (most dropped to a B-C average). Average students (B-C) were failing, or the parents were paying big $$ for tutors.
I later found out that his reading class (the second highest level in 6th grade) was reading at a 4.5. He was in the highest math level, and had not covered fractions, or any pre-algebra or pre-geometry.
I tested him that summer and found on most subjects he was 1- 1.5 yrs behind. At first homeschooling was just our plan for a yr, to get him "caught up".
Well I started seeing big changes in DS (in a good way) when we started HS'ing. He was no longer stressed out, and he actually enjoys learning again (something I haven't seen since 1st grade).
With DD we actually planned to put her in PS. She attended a private preschool last yr. Her preschool teacher and I both agreed she was not ready for K this yr. She just made the cut off by a few days, and would be one of the youngest in her class. There isn't a young 5 pre K/K program near us so we decided to homeschool her this yr. As the yr has progressed (and the local school has made the local news as being on of the worst in the country) we've decided to keep her at home for now. With her we will play it by ear. We will probably enroll her in a few enrichment classes next yr, mainly to give us a break from each other.
In GA it is "all or nothing" too. There is no dual enrollment. However because of the poor condition of the PS' there are plenty of other alternatives to "fill in the gaps". The group we belong to has classes (DS took a wonderful ancient history class through them), 4 H, social days, field trips, book clubs, teen community projects etc (the list is very long). Many local museums, nature centers (etc) offer free or very inexpensive classes. There are also private part time schools. One is a 2 day a week school, the other is a 3-day a week school. Local churches and HS supply stores also offer enrichment classes.
We are using Calvert K for 5 DD and Great Books Academy (8th grade) for 13 DS. We supplement their science with The Jason Project, and they are each studying Spanish with Power Glide. DS is also participating in a student Government project called S-GAP.