My son really detests repetition, and I suppose this is part of his dislike of rote memorization. Time pressure is a big drag for him, he does not do well at all when time is emphasized, like freezing up 'under the gun'. When working challenging problems where the computation is only a small part of the bigger process, he doesn't stress out about the computation, so does much better all around. Master of none's description sounds very familiar!

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