Because of some classes being year long and others block schedule- at the end of the year you need to do the following-
in each class-
go to Manage
Average setup
Yearly average
averaging method tab ...
choose computed avg combinding ...
in the column labeled percentage- put in 100 it will look like you cannot type because you do not have a cursor- but keep trying in the block and it will let you type- then ok- your way back to grading

Screen shots of how to set up final exam and yearly average: