<Tr> <Td> 3rd </Td> <Td> November - 3rd week of December </Td> <Td> Christmas break: approximately two weeks </Td> </Tr> <Tr> <Td> 4th </Td> <Td> January - mid-late March </Td> <Td> Summer break: approximately eight to nine weeks and it separates one school year from another . </Td> </Tr> <P> The academic term for senior high school (grades 11 and 12) operates on a semestral basis . Semestral, Christmas, and summer breaks are scheduled at about the same time as primary and junior high school . Grade 12 pupils have a shorter second semester than grade 11 in order for the school to prepare for graduation . </P> <P> In most schools, summer break usually lasts for two months, starting from the first week of April up to the last week of May . Most schools end the school year before Holy Week . Semestral break is normally set to coincide with All Saints and All Souls Day . The Christmas Break usually begins in the third week of December, and classes resume the Monday or week after New Year's Day (unless that Monday is January 2). Commencement ceremonies are often held in late March or early April . </P>

When does the first semester of high school end