My DS's school, at the the time of the skip, used NWEA MAP score for the above level testing. It wasn't one of the "recommended" IAS tests, but since they had norms (not grade equivalents) for all the way up through 12th grade, the school was happy substituting it. Before they would consider a skip, they wanted to see him scoring 95th percentile for the receiving grade.
I don't have our paperwork anymore but I'm pretty sure they used IQ for Ability, NWEA tests for Aptitute and both WIAT and current NWEA scores for his grade level for Achievement.
As for whether not they would be bored, I've seen varying research. In general, the idea is that you want the child to still be in the top 15% (give or take) of the receiving grade. You do not want to skip a child who will be suddenly struggling and the general estimate is to skip them only if they will still be in the top of the receiving grade classroom.
