This was suggested for our 5 year old. He struggles the most with hyper activity and lack of focus. He can focus when not over stimulated and very interested, but most of our interactions and his learning including language is done in short spurts. we were advised to try to treat it naturally first. School and therapy want to treat it behaviorally.
I did speak with the home room teacher for the student on Tenex. She claims that she can tell a difference between when he doesn't get his medication at home and when he does. His is at least twice a day dosing, then, because I give him a dose at his lunchtime as well. The teacher commented that he seems more focused and has a better attention span. I'm not an advocate for meds unless they're clearly needed, so no bias here! Hope that helps some. The good thing is that if your family does choose to go this route, you can always wean your son off the med if you don't think it's helping or has bad side effects.
My son has been on Tenex in the past. It worked well for him. He was able to focus better. This medicine did not lead to drowsiness in him which is always a worry for me with school. He requires some behavioral support as well but I feel Tenex did help him.
Is the medication Tenex? I'm a nurse, now specifically a school nurse. I have a student or two taking Tenex. I'd have to ask their teachers how the med affects them in class (I don't see them in the classroom setting very often).