Our DD 11 did this and did quite well.
She had done AOPS for rigour which helped her over some of her perfectionism/stress over wrong answers. The intro to combinatorics and probability class that she did Last academic year was absolutely the rock that broke the tide of her perfectionism.
Some of those Alcumus exercises were relentless in their tendency to revert from green through amber all the agonizing way to red before finally being wrestled back again and eventually into the blue. At first, this was quite aggravating but eventually she became more pragmatic - still not entirely mellow but vastly improved.
There are several on this board whose progeny have gone far further earlier.
IMO, mental readiness trumps calendar age.
Last edited by madeinuk; 11/15/16 04:40 AM.