I am about to purchase Abeka spelling, language arts, Science, and History for Grades 2, 4, & 5.
For those who have used Abeka in the past, how necessary are the TM and Test keys for these particular grades and subjects? I've never used Abeka before and don't want to buy the TM and test keys unless necessary. On the Abeka curriculum website some of the TM/test keys state they are optional, some don't.