As a kindergarten teacher, I encourage parents to make sure they provide plenty of opportunities for their child to socialize and interact in groups of children. It can be quite a shock to a child becoming 1 of 20 or so, especially if they've never been a part of a large group before. Also, be sure to give them plenty of chances to practice and "play" with school tools (glue sticks, drip glue, markers, scissors, etc...). Not only will these be great skills to have, but it will allow them to focus more on the learning and work involved versus how to use or just exploring these items.