Thinking about having DS achievement tested. What are those tests like? Is it like a MAP type test? DS is slow with computation but can understand virtually any abstract concept. Will the slow computation hurt his score? Do we need to review topics with him beforehand?

We are considering this to: avoid the portfolio route for DYS, because it's quick way to really figure out what grade level he should be in and because it shouldn't be so costly. Thanks for any input!