Honestly, I think they push the kids too hard too early these days! My son is 4 and will be in JK in September as well and has been in 5 day a week half day preschool this year and he can't even write any letters (except for a wobbly O). He loves to do creative art and loves books etc, but I am relly not keen on pushing things on him yet if he isn't ready. I didn't start school until I was 6 and I learned to read and write very quickly at that time, not before. I wouldn't stress about it!