Students in northern Nigeria are opting to stay at home after a series of attacks on schools.<br /> <br />Boko Haram fighters who reject western education are blamed for killing 700 people since the start the year. <br /> <br />Eighty-five schools have been indefinitely closed in Borno state.<br /><br />The most recent school attack was in neighbouring Yobe state.<br /><br />Al Jazeera's Rawya Rageh reports.