I didn't focus so much on the intial post here. Unfortunately, I'm not sure there's much benefit to skipping/acceleration for science and/or social studies in the elementary years....In my experience though, 4th grade science, 5th grade science, etc...is all just "variations of the same". The expectations are probably a bit more in-depth with each passing year, but without a true end goal (or an outright grade acceleration), I would try focusing more on depth than distance.
I'd absolutely agree with this. Dd#1 said that she didn't learn any science at all until middle school when they started doing actual science labs in a separate classroom with Bunson burners, chemicals, dissections... We did sign her up for some extracurricular science programs outside of school prior to then, though, in which she learned something.
