It is often best to discuss scores and their interpretation with the test administrator or school personnel as they have the full context for your child's testing experience, purposes, cohort, etc.
In general, your child scored better than 99% of the cohort in many areas and better than 67% of the cohort in math.
You sound concerned about the math score. There may be many reasons, and you may wish to explore this with the test administrator or school. For example, the cohort could have a relative strength in math, have had more exposure to math, more practice with math, or it might be a relative weakness for your child, your child may have run out of time, or not finished for other reasons (being distracted, etc). While one could guess at many plausible explanations, conjecture does not serve to get to know your child's profile as seeking the facts does.