A 140+ IQ and my elementary grades got me into advanced courses in middle school. It was a disaster.
Im clinically diagnosed with severe OCD and anxiety and it becomes crippling when I'm under too much stress or if a major change happens in my life. I won't go into detail but its enough to drive a person to suicide, and it does drive some unfortunate people to suicide.
With the increased workload of advanced courses, and the normal stresses of starting middle school my OCD and anxiety became dangerous and I was on the verge of a nervous breakdown. As my OCD got worse I couldn't get my homework done because I was literally destroying my homework trying to make it perfect. Even the slightest imperfection in my writing and I would erase it and start over. I often erased holes in my papers, or I'd get so frustrated I would tear the work up. Id write a letter and go back over it over and over and over until I'd tear through the paper. Most nights I was up until 3 or 4 in the morning. My mom was having to stay up all night with me and stop me destroying my work and help me finish it. Both of us cried a lot that year. My increased OCD and anxiety was also making it so I could barely function outside of school.
Needless to say my parents weren't willing to risk my health and sanity for my advancement in life. And that was the end of that. They pulled me out of all advanced courses, my OCD and anxiety lessened, and I got on with life.