My DD goes to public school, but I imagine the assessment is about the same process. At ours there were I think 4 stations, each one tool maybe 10 minutes. One was physical where they had her do things like jump, stand on one foot, walk a straight line, etc. One was fine motor and she had to string beads on a string and a couple other things. One was language where she had to recognize words and letters. And the last one was supposedly social / emotional. That last one bugged me the most. Part of what they had to do was take a drawing of a person that was half way done and then finish it and then the guy asked her some questions about it. In the end they give you a final score and someone comes to discuss it with you and how the kid did and whether or not they are ready to start kindergarten and what they need to work on, etc. Relatively painless really. We tried not to make a big deal of it and DD did not seem nervous at all. She thought it was sort of fun and games. But then she had also attended montessori preschool so the activities were mostly not unfamiliar to her.