SATs - depends on a few things.
1. does your state law require annual testing? If so, in most cases the SAT and ACT are considered nationally normed tests for annual evaluation requirements.
2. Do you want to go to a college or university? If so, does the college require a SAT or ACT score? Some colleges waive the test requirement if your grades are good, you have extra curriculars, you have lots of volunteer hours, you write an essay, etc. Still, I recommend that if someone wants to go to college they take the SAT or ACT.
As for a "proppa skewl" most homeschoolers think learning outside of a school is more natural and proper, but that's a matter of opinion.
Take care,
Meg <img src="/images/graemlins/smile.gif" alt="" />