FWIW, I gave my DS's teacher a heads up, but he is the kind of kid who will not say anything at all if he's the least bit afraid that he might say the wrong answer. He also has a number of unusual sensory issues that are inter-related that I felt like she needed to know. As of right now, he is being subject skipped to 2nd grade for both reading and math and loves school. He is in a charter school with a STEM focus.