I did that last year. I had 3rd grade and went up to 4th with them. It was great cause you know where they are and what they can do as well as who doesnt need to be with someone in the same class. The only downfall that I found is that they are very comfortable with you and do want to just talk and be more of a friend. But that wasnt that big of a deal. I loved it and would do it again. One time I looped from 3rd to 4th to 5th with the same kids. That was very tough to let them go after 5th grade. We had all bonded so close. One parent said she felt like there was a tunnel from her house to my house the way her child called me all the time. I am still very close to those kids today, they are sophomores in college now and still contact me all the time. Good luck with your group this year, enjoy it.