This is an elementary link, but I thought it might be helpful as a resource for some of you. I am not sure at what point this gets changed for the following year or even dropped until the next school year. If you are interested, you might want to download soon.
I am not sure if there is a chance of getting previous questions from the competitions or not. The person to contact with that would be Kyle Harrop. kharrop@iasp.org
The invitational questions at
http://www.iasp.org/dspmath.aspx are a mixed bag. Some are relatively easy. Others make one think. There is a time during the "season" that practice questions are posted. The competition for the kids is the first Tuesday in March every year, so the postings are sometime prior to that.