After three years of forced truancy due to ISIS’ seizure of the Iraqi city of Mosul, teenager Ali Salem waited nervously outside school to sit an English exam. Before heading out bright and early from a camp for the displaced in Hajj Ali, 60 kilometers away, he had had a last look over lessons that were interrupted in 2014. "On the evening of June 10, 2014, we heard that ISIS had taken over the city. I had a maths exam the next day but school stopped," Salem told Agence France Presse in front of the gate of the school in west Mosuls Mansour district. "Im 18 now and Ive lost three years because of ISIS. Im so glad were back at school to be able to pass exams because all this will determine the course of my life," he said, with disheveled hair and a schoolbag strapped across his shoulder. Because of the disruption for the 300,000 pupils in Niniveh province of which Mosul is the capital, the education ministry has decided to set IQ tests for primary schools and general knowledge exams in secondary. A block of houses away, also in the Mansour district, next to a building toppled by an air strike, another pupil was waiting anxiously to take the same English exam. "Ive forgotten everything, and Ive only managed to get a photocopy of one chapter whereas they can question me on the whole book," fretted Mahmud Abdel Nafaa, also 18, as workmen laboured to fix drains and pavements smashed by shelling. "Im really happy to be back at school but also worried because if I fail the exams I will be transferred to evening classes," said the young man in a red T-shirt and with black slicked-back hair. Abdel Nafaa said evening classes were held only twice a week, and they have become mandatory for pupils deemed too old to follow the syllabus. The new academic year started in early October in the eastern part of the city, from where Iraqi security forces expelled ISIS militants in January. But classes and exams will not resume in earnest until the start of November in west Mosul, where the battle dragged on until July. Mosuls education system, with its pre-war tally of 600 schools, has paid a high price for the months-long fight. Only 210 schools are left standing on the east bank of the Tigris river that runs through the city, and 100 on its west bank. In his office building with its completely burnt-out ground floor, the director general of the education ministry for Niniveh province faces a mammoth task. "Were the second line after the armed forces. They liberate, and we have to rehabilitate right after," Wahid Abdel Qader said. "Already back in January, when the east had barely been liberated, we noted that families were eager for school to restart," he said. But with bombardments rocking the west, schools in the east waited until May and June to gradually restore classes. Mohammed Ismail, headmaster of the Zubayda school in east Mosul, said he languished at home for three years. "In our district, only one school stayed open," under ISIS supervision, he said.  "Some of my colleagues worked with them,” he said, adding most of the pupils under ISIS were French, Russian and Chechen children of foreign militants. In the playground of the Zeitoun school overlooking the east bank of the Tigris, six-year-old Yussef Razwan showed off his first reading book.  "Playing at home is boring. I prefer being here," the little boy in white uniform beamed.