Bumping this post and adding a link to your other related post and also a somewhat similar recent post, Is my child gifted?.

Originally Posted by Cynthialcy
worry about his social interaction, as well as his separation anxiety... hard for him to go to preschool by himself when he turns 3.
Most preschools are very adept at transitioning the child into an activity at drop-off time to keep the child's mind busy and focused on something pleasant and happy.

Good luck!