Each level basically builds a little onto the previous level so Apple had just a little more work to do for each lesson than Speedy did. My kids are fairly familiar with the Old Testament so these studies worked as a review for them. It's been awhile since we focused on memory work so I was pleased to see a good deal of memory verses included in each level. Since my Sunday School class has been reading through the Bible and we started with the Old Testament at the beginning of the year, I didn't have to review too much to be prepared for the lessons. GrapeVine studies offers this chart below to help you know where to begin your family studies.
Periscope: @Grapevine Studies