Academic Competitions, which can be very useful and inspiring, usually go by grade, so skipping isn't an advantage there.

Talent Searches, such as CTY, qualify by grade, so skips can work against the child - and they don't assign the classes by grade, but by age, so that seems double unfair to me. Sigh.

Skips are great if they let your child attend a public school and keep in their readiness level, but they do have drawbacks.

Coaching available, at SchoolSuccessSolutions.com