How to help a teen with English lessons?

My 15 yr old son has HFA. He goes to a special needs school and is doing great, apart from his English lessons. Even though he is at this school, he was getting held back with his Science and maths lessons compared to class mates.So for those lessons he goes to the normal secondary school in the same complex, a couple of hours a week and he is getting on great and enjoys it. But when it comes to English and other lessons where writing is involved, it's a disaster. He's struggles with writing stories, descriptions, his hand writing is only just readable, so how the heck he is doing so well in science is beyond me. His teachers seem to have given up on him, accusing of "putting on the autism act, because he can  skip off to his Haughton lessons happily and get them done". This was said between his teacher and a TA within earshot of my son and one of his class mates heard it as well. What has been said is out of order, but I know that this is getting frustrating for everyone especially with GCSE's coming up soon. Has anyone any advice on how to help my son? We are not sure if it's a psychological problem or if there is something wrong medically   Thank you to those who read this and thank you for any help you may be able to give.

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