I'm in my 30's, but I skipped several times and I can give my story.
In 3rd grade, I went to half day 4th grade and never felt like I fit in socially. I got straight A's in 4th grade subjects but only ever played with my 3rd grade friends.
In 7th grade, I went to 9th grade for science and math at a local high school down the street. I felt very intimidated being in a high school and it affected my grades. I passed with B's and C's but had a very difficult time adjust socially.
I went to 9th grade, but skipped 10th grade. Junior year was the first time I felt comfortable with my classmates. Did well academically, but then felt that my classmates were too immature. This was probably the best social fit for me of all the accelerations.
From my experience, academically I did fine with all accelerations but the social aspect was difficult for me.
Hope this helps!
