I think it would be good to try something different. First I would get them good at typing code. This way they will not have to think about typing and thinking, they can just think. Second I would figure out a way to get them used to the concepts of programing, like for loops, variables, ect.. by doing other tasks. For example run a soccer drill like a for loop so they are learning secondly. I think this might help with some kids giving up early since its hard. It should be a little easier since they will have some experience with the concepts since they have run the drill before. Hope this makes sense, good luck!