Last school year we used Elementary Greek Year 1 with my 4th grade son and 2nd grade daughter. I highly recommend this program for teaching Koine Greek to children. It is broken down into 5 daily lessons per week. I did the lessons orally with my kids. Our oral lesson was followed by a workbook exercise that went with the lesson. The oral portion takes about 5-10 minutes per day and the workbook can usually be done in 15 minutes. There are 5 vocabulary words per lesson except for review lessons that do not introduce new vocabulary. There is a memory verse each week along with reminders in the text to periodically review the memory verses. The first year covers conjugating present tense verbs, as well as masculine, feminine, and neuter noun endings, adjective and article endings. It really is a lot of material in a relatively painless manner.
I bought the whole set which included flashcards and a pronunciation CD. The flashcards are really nice cards and it was worth it to not have to make them. The CD didn’t get used a whole lot. This was mainly because the cd player in my van is messed up and won’t skip tracks which would force us to listen to the whole thing. That gets a little old because it starts with the alphabet and each letter sound. My kids using the program were in 2nd and 4th grades, but it would be suitable for an older student just as well. There is nothing cute or silly about the program. I learned Greek along with them. We had studied Greek the year before using Hey Andrew Teach Me Some Greek levels 1 and 2. Hey Andrew was good for what I wanted to use it (to teach the alphabet well), but Elementary Greek is much more for the money, plus it is much more systematic and logical. The only part that might have been too fast for a younger student was the alphabet, Elementary Greek spends 2 weeks on it. I have purchased Year 2 for this coming year and am looking forward to it.