We currently homeschool DS5, who's kindergarten age in our district. I'm happy to continue doing this, but my husband worries that DS isn't learning enough. (Basically, there aren't enough completed worksheets lying around the house and he frequently comes home to find DS playing video games.

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Hubby would like to see some sort of impartial proof that DS is "where he should be". He's defining this as "greater than 50%tile" which is definitely doable. But where to get this done? I've read about the SAT (Stanford Achievement, not college SAT) as a test that homeschoolers give. Is this the best option? Are there other (better) choices? Should I contact the school district and see if he can sit the test (if any) with the other kids?
Any free options?