DS age 8 has trouble responding to spoken instructions and usually has to be asked several times before the penny drops that he's being asked to do something. He then forgets what the instruction was and becomes distracted/wanders off. He's told us that he really tries to focus on what he's supposed to be doing but it's like his mind is pulling him away from it, to the point where he can't mentally put the steps in place to do the thing (even something as simple as brushing his teeth). It's frustrating and very time consuming, and we're all at the end of our tethers.
At school he's flying academically but is badly organised and slow to start work, meaning he's often having to catch-up. Conversely he does really well in written/online assessments and often achieves maximum scores. School have started making noises that he could be facing a barrier when it comes to processing spoken information and instructions but they don't know what it could be, and neither do we. The SENCO is great but at the minute she's at a loss as to how to support him. We're a neurodiverse family with ADHD and ASD on both sides but DS doesn't quite seem to fit the mould of either of those, nor does PDA seem to fit, so we're not sure where to start with getting him assessed (which we'd like to do so that if there is a reason we can work with the school to support him). Does this sound familiar to anyone and can anyone help to shed some light?