We have been down a long journey in helping our son to be and do his best, and unfortunatley the schools expect many kids to sit still and to the activites- it does not work so well for the boys.  We investigated further, and found out that our sons adhd behaviours were actually part of a bigger picture and got him evaluated (privatley) by a psychologist and found out there is a lot more to the situation.  He was diagnosed with Aspergers syndrome with ADHD tendancies, among other things.  Having this diagnoses puts him on the autisim specturm and qualifies him for state/federal services (free) once the paper work is completed.  
you may look into this for Africa, additionally,7 is young for that diagnoses, he still has time to grow and develop.  Give it time and speak with social sevices, a psychologist or school counsler and see what options they suggest.  Best of luck:)