Speaking as a parent who has done testing more than once, one could spend a lot of money and never receive a definitive diagnosis or receive conflicting diagnoses.

We saw a gifted expert, and we also saw someone who does other assessments, one of which is the T.O.V.A. The later definitely demonstrated what we were observing.

We then had conflicting assessments; for us it came down to trying interventions for ADHD and executive function. And in our case, it helped.