These are the teaching materials I used when I was taking ECC classes from ages 3 to 6. The materials used in class include 3 DVDs, two sets of CDs (2 CDs per set), and one single CD. I also have an unopened CD that I received from ECC, so I don't know what's on it. The DVD packaging has some scratches, but the contents are not affected. Would these be suitable for home study?