Although it does seem to be for more advanced grades, I believe it has a few helpful videos for kids in earlier grades, I'm in the 9th grade and use it as it helps me quite often with some problems that get me stumped or lessons I cant get a grip on. Try using it and see if it helps your students. If it doesnt then you will have your ansewer I guess. Or if its just not your thing you'll know!
Hope this helps,