He is 4. Four-year-olds shouldn't even be in "school." I hope this school only is a couple hours long!
At age 4, kids learn to sing the alphabet and other songs, how to get along with others, how to play and get hurt and deal with it, fingerpaint, draw pictures on blank paper (not coloring sheets), stare at a bumblebee for 5 minutes straight, count simple things, hold a pencil, & page through the numerous books I'm sure you offer him. Short list.
Don't knock yourself or your kid if he doesn't want to trace a letter.
Most kids' brains don't wire themselves for reading or writing until late age 6. Yes, I know you get pressure from a lot of other parents who insist that their kids are brilliant. All kids are brilliant-- when they're allowed to shine when their brain is good and ready.
When teachers and parents push kids too hard to learn things they're not ready for, you run the risk of turning that kid "off" school--an attitude that can be extremely hard to break later.
It's a recent phenomena to move first grade standards into kindergarten (let alone preschool!) Lately, academic standards are unduly influenced by politicians rather than educators who actually know HOW kids learn.
Scandinavia leads the world in test scores. Scandinavian kids don't even start school until age 7. They understand that kids need to experience being a kid - playing in mud, learning their limits, discovering and creative play--all builds confidence. "Being a kid" sets the foundation for all future learning.
Please don't get caught up in the mommy competition. Let your kid be a kid. Do some reading on child development (and share with the teachers).
Boys Adrift, by Dr. Leonard Sax, is an excellent read for any parent of a boy. As women, we have zip experience having a boy's brain--so we are beholden to get some insight from the experts!
Enjoy your wonderful 4-year-old this summer!