Should I consider having him tested to facilitate skipping a grade?

It sounds like you have a kiddo who loves learning! I would encourage you to explore the Gifted & Talented program at Wayzata. You can find it here. Wayzata takes pride in working collaboratively with families to make sure that the needs of each and every student are being met. As you will see on the website, there is an early entrance application process for excelling learners entering Kindergarten. And for students already enrolled who are demonstrating outstanding academic ability, there are staff people designated at each school to assist families with extra curriculum support. You can explore the website to find each contact email depending on your child’s specific school. Thanks for the question, I hope this is the lead you needed!