Kids who cannot stay focused are usually very smart and enjoy attracting attention to themselves. When they are not noticed they get bored and they start messing around to gain attention. This is very common, especially with the second child in the family. There are reasons why this develops, and appropriate care is necessary for them to attain personal satisfaction on their own .
The goal here is to have the child satisfy himself with his accomplishments, and not have him concerned with what others think.
First piece of advice: do not over-praise your child in front of him. When he accomplishes something exceptional, acknowledge it moderately and reward him. And remind him that it is the will of Allaah and then his efforts that he was able to do this.
Second: the child must learn how to have fun on his own. Find individual activities to occupy his time with, rather than group ones. In a group of kids, he would always love to get involved. But due to his attitude not all kids would enjoy playing with him. Even having simple individual games like puzzles, or anything really.
Some dua's you can use to aid you inshaAllaah:
اللهُمَّ لا سَهْلَ إلا مَا جَعَلتَهُ سَهْلا وَ أنتَ تَجْعَلُ الحزْنَ إذا شِئْتَ سَهْلا
Allahumma la sahla illa ma ja’altahu sahla, wa ‘anta taj-alul hazna idha shi’ta sahla
O Allah! There is nothing easy except what You make easy, and You make the difficult easy if it be Your Will
More here:
http://www.searchtruth.com/dua/index.php?dua=50
Istighfaar and Hamd are the best ways to get what you want. Ask Allaah for forgiveness and be thankful to Him sincerely in the day and the night. Show your acceptance of Allaah's will, and be thankful for it even if it appears to be bad for you.
And if you have a decision to make for your child, always remember to do Istikharaah before taking the decision. There is a thread here on it if you aren't familiar with it.
