California Only
Find Law CA lists the State Compulsory Education Laws, including ages at which attendance is required, home schooling provisions, as well as penalties for non-compliance parents. For example, homeschoolers in the State of California can go to the Christian Home Educators Association of California and see state requirements:
CA Department of Education explains who should file al Private School Affidavit form in California: Form Link
Can Homeschoolers Play Sports in Public Schools? This link begins to answer the question. States determine their own laws on homeschool participation in local school teams since there is no federal regulation governing this question. For example, California says “No” while Ohio says “Yes.”