I don't know your tests but if it is a fill in the bubble job is it possible he skipped a question and therefore all the answers were in the wrong place? The right answers could be from before the error. Or is he the type to make patterns with the answers or massively overthink and confuse himself? Also is the second percentile for all kids or just the ones that got to phase 2. Being in the 9th percentile of the top 10 percent of students is different than being in the 9th percentile of all students.