I'm not a parenting expert, but I did study child development and I have successfully gotten my kids out of the preschool years. I'm happy to share with you what I learned and what I wish I learned sooner. Just know, this parenthood thing is hard for all of us and in my experience it just gets better as they get older so enjoy it as much as you can.
This a comprehensive post detailing exactly what your kid needs to know before kindergarten; academic, social, and classroom skills.