The majority of all sessions missed during the week of 7 June to 11 June were due to schools being closed to all pupils (code “#”).
Roedd mwyafrif yr holl sesiynau a gollwyd yn ystod yr wythnos rhwng 7 Mehefin i 11 Mehefin oherwydd bod yr ysgol ar gau i bob disgybl (cod “#”).