Kindly ask your son to recite sura aala Surah no 87 after the fajr prayer and recite following dua before study.
اَللّٰهُمَّ اَخْرِجْنِيْ مِنْ ظُلُمَاتِ الْوَهْمِ وَ اَكْرِمْنِيْ بِنُوْرِ الْفَهْمِ
اَللّٰهُمَّ افْتَحْ عَلَيْنَا اَبْوَابَ رَحْمَتِكَ وَ انْشُرْ عَلَيْنَا خَزَآئِنَ
عُلُوْمِكَ بِرَحْمَتِكَ يَا اَرْحَمَ الرَّاحِمِيْنَ
O GOD, please bring me out of the darkness of doubt and favour me with the light of comprehension,
O GOD open to us the doors of your mercy and unfold for us the treasure of your knowledge by your mercy O the most merciful of the merciful ones.