Schooling Options - Middle School

Is there a charter school that will allow a child to potentially test up a grade? Looking for one in Denver (wash park, cheeseman or sobo). Also would consider Englewood. 5th grade son is bored and teachers and isolating him when he gets bored and doesn’t pay attention. We don’t like the current school (Denver Language School - Gilpin) and would like to move him. We also would consider a homeschool group and I looked into DSSP but couldn’t find much about it. Any suggestions would be super helpful. We just want him to be more engaged. Some of his classmates can’t even read yet and he tested at a 10th grade reading level and 8th grade math.