Child refugee counts his blessings - and worries

Mahmoud, 17, struggles to focus on his studies while fretting about the family he left behind in war-torn Syria Maths is the first class of the day. Only two students, who are clearly aces at maths, are raising their hands to answer the teacher's questions.Almost everyone else is dozing off. But Mahmoud, seated in the first row, appears to be wide awake.