I have yet to hear of any curriculum that keeps up with state standards by itself. I know many, many people who have home-schooled and most of the kids I know have grown up struggling in high school or college if they stick with one curriculum. There was this one family, where both the husband and wife owned a very successful businesses, that I thought had the home-schooling plan down to a tee. Turned out, her oldest couldn't get into a college, and was struggling with passing classes in his vo-tech school. They were beginning to realize their other two were going to struggle, as well.
I supplemented my kids early education with Abeka when they were smaller. There was no way that curriculum even came close to what they were being taught in the Public School they were going to at the same time - and they were in a special needs class in the public school.
I grew up in an A.C.E. school (Accelerated Christian Education). Both my brother and sister completed every Pace that had ever been written, and aced most of every test, too. They had to graduate one year early because the curriculum had nothing else for them to do. They went on to attend NNU (Northwest Nazarene University) - the only college my parents could find that would accept them. Both of them struggled. My brother had to switch his degree to a ministerial degree just to get through and graduate on time, and my sister had to go to NNU for a few years, before she could switch to a state college. She ended up having to go to college for 10 years to successfully get the degree in finance that she wanted. My brother did not become a minister, but he had a degree that helped him get a good job in the work force. He spent years being disappointed that he was never able to get into the architectural field he wanted to be in. I was switched to a public High School in 11th grade and the school counselors told my parents that I was so far behind academically, that they could not ever imagine that I would ever make it into a state college. I did get it into a state college, but my 11th and 12th grade years were brutal. Gratefully, I had very sweet English and math teachers who were willing to have me stay after school to help me.
My recommendation to any homeschooling parent would be use multiple curriculum and make sure your child is keeping up with state standards. You can pull them from the Internet here: http://www.k12.wa.us/CurriculumInstruct/learningstandards.aspx . They are huge documents, but it is worth making sure your child keeps up with what the Public School system teaches. I've seen far too many kids, from well-meaning parents, come into the public school system after being home schooled and really struggle. The child's ability to get into college in the future will rely on the kid's being able to pass college entrance exams and those exams are based on what is taught in the Public School system.
Edited to fix the link.
I don't think its just with keeping up with the school. I know of several home schooled children that did excellent in college. I know of one lady who graduated from collage at the age of 16.
What I think happens with homeschoolers is that they never get a chance to learn how to tell what different teachers want when they do tests because they are all taught by the same parent.
My husband was home schooled and he still aces most of the tests he is given.
I am planning on homeschooling my child but I also am looking into programs where I can let another mom teach a class so she gets taught by different teachers.