Teri just doesn't make up tests. They go through a home school company that provides all of the instruction material and test materials. It's all standardized as it has to be to gain state and federal approvals. It's just pure speculation to even mention the possibility that she's only being taught what's on the tests. I wasn't home schooled, but I know others that have been and parents that have done it and they don't get to see these tests until it's test time and they are mailed to you. So the parent/teacher will not be in a situation to only teach what is on the test ahead of time since they don't know.
Also, if anything most parents would put the extra effort into seeing that their child was learning as much as they can vs the current sad state of teachers in america that are often underpaid, but also protected by unions and nearly impossible to get rid of for poor performance because of union protections.
Anyway, my point still stands. Doing research into homeschooling before making assumptions would probably ease most fears.
Chloe seems like other home schooled people I have met. By that I mean she seems more intelligent and mature for her age than the average 15yo who attends a traditional school.