Help your child get used to your not being there, a little longer each time. Reading a story to a group of children sitting in a circle is a good way to do this. You can ask them questions about the story and how they liked it. That way, they can learn to raise their hands and wait to be called on. Having a few other children around makes it more like a real school.
Children can take turns playing teacher, too.
Boys as well as girls should be encouraged to do this. A teacher is a very important person. One of the most important things for parents to remember is to try not to do things for children which children can do, or could learn to do for themselves. Lots of us think that being a good parent means doing everything for our children. But it depends on what kinds of things we do.