Hi Snow white,
 
It depends - I am in the southern hemisphere so our terms are different to yours - but I will try to help.
 
Term = the period between the holidays (eg in NZ they have 10 weeks of teaching then 2 weeks of holiday so there are 4 terms in the year)
 
Semester = I have only ever heard this word used when the year is split into two parts.
 
So:
 
�End of Year� - is fine when you are in the southern hemisphere - as it means literally the end of the year - and children go into a new class after the New Year.  In the northern hemisphere - I do not think they use that term - but I could be wrong.  I would definitely not use �end of half year�.
 
�End of term� is perfect if the time period was for say 5 - 15 weeks.
 
�End of semester� is perfect if it is the end of the half year.
 
Hope this is clearer than mud.
Vicki