I recommend taking the SAT and ACT as soon as possible (summer/fall) and make sure he takes at least some challenging AP and/or Honors classes in his junior year while maintaining a high GPA. We found with our son that being able to demonstrate to HA coaches that the academic eligibility component was taken care of prior to/early in the junior year was a big advantage. They were primarily interested in weighted GPA. If your son wants to pursue it, try to attend a HA camp, such as HeadFirst, in the fall of junior year.