Hi...I'm a Kindergarten teacher...I think Pre-K is a great foundation for K...but it's really your choice on if you want your son enrolled or not. I don't know where you live, so expectations may be different, but this is what I look for entering Kindergarten:
That a child:
*can independently pack and unpack schoolbag
*zipper pants/ jack
*share/take turns
*talk one at a time
*sit on carpet pretzel style quietly (this would be learned in pre-school) for lessons or stories
*Count 0-15
*Write first name and read name
* Say alphabet
* Recognize letters
* Recognize numbers 0-10
* Recognize circle, square, diamond, rectangle, oval
* can recognize rhyming words if given to him (cat and hat)
*Can trace over dotted lines
*Can draw a face
*Understands words such as over, under, inside, outside, next to, etc
* Knows primary colors
Hope this was helpful. Good luck to you and your little cutie!!!
