We do not advise you to register your child in a higher class. You should only do that if you have already been preparing for Kangaroo Math for at least two years, and you know exactly what you are dealing with. Generally, we have to move children 1 (or even 2) years lower, so they can cope with the level of complexity involved. We also test children at the beginning of the year, so we know their level as they join the class. You can always switch to a class higher if you think your child is insufficiently challenged in the first month. This being said, the problems are super fun, and the children will enjoy them tremendously.