PABest S4 pupils at St Columba's High School in Gourock, Inverclyde, wear protective face masks during their chemistry lesson. PA Photo. Picture date: Wednesday November 4, 2020. Senior pupils and their teachers are being advised to wear face coverings in classrooms at schools that are in the Tier 3 and 4 areas of Scotland. The Scottish Government has released new guidance on school safety to take account of the new five-level Covid alert system. Photo credit should read: Jane Barlow/PA Wire