Post 16 with autism

Hi I have a 15 yr old who is 16 this yr, he attends a great special school but were unsure as to whether it's in his best interests to stay on post 16 or find him somewhere else. He wants to be an author, I've been looking to see if there are creative writing courses that are suitable but I suppose its like everything it needs to be tailored to his abilities. Does anyone have any ideas or experience?