Hi KatieM, your son's symptoms mimic my own from childhood. I won't comment on everything you are looking for regarding legalities, teachers' consciousness, or his being OK with social anxiety, but I will advise you on how to help him with his English assignments. If it suits him, start keeping an English composition reference book that he creates for his own use. Go slow at first, then build on what he acquires over time.
I don't think that people with ASD fully assess or even concern themselves with the qualities of a person in the way an English essay requires. This may be because we don't have that kind of assessment of people in our radar. We accept face value and exact words in our interpretation. Digging deeper requires training, and the training is not anything magical. It is just a methodical approach to story assessment and character analysis. This is a classic case of not seeing the forest because the trees are in the way.
Most people, and adults in general, can form an opinion of a character from their actions within a context. You should start reading with him so that you can discuss the characters and the story. Discussion helps memory and helps form opinions, yours and his. The words in the story have a direct relationship to the character by describing the person and explaining his/her actions. You should take it further by using imagination, and interject your own views for your son to agree with or disagree with.
The objective of working with him is to open up his sense of resources within himself that can help him for a strong opinion of a character or situation. When you read about a character, and you have enough information to form an opinion, ask simple questions and complicated ones as well. Referencing the character you might ask: Where is he/she? Why is he there? Where was he before this? How do you know? Did he talk to anyone along the way? Where does he live? Who lives with him? Is he happy or sad? Is he trying to accomplish anything? What do you think he is wearing? What is the weather like? Does he know this place well? How does he know this place? Is he looking for anyone? Do you think he will be successful? Why? etc.
The words in the story can be just words that a student reads. Reading difficulties can make interpretation of a story difficult. For an essay, or story, the student has to use the facts stated in the story, as well as inferred information that comes with exploration of possibilities. In order to form a picture, to make this character more human, one must explore beyond the words in the story.
Consider phrases such as: It was a sunny day in Mayfield when Tom decided to go to the corner store. From the sentence alone, you can infer a lot of information that helps create the persona of Tom. Why is it called a corner store? Has he been there before? Was he wearing a jacket? What do you think he wanted to buy? Did he go alone? Why does anyone go to the corner store? Where is Mayfield?
As one who rejected reading as a child, and never performed well on tests, I believe that the role of ASD simply means that the student needs to be aware of forming an image of a story to help with memory and fill in the background to the events. A child doesn't do this on their own. They have to learn how to build the images from facts and simple imagination.
I remember being given a brochure about "good study habits". Let's all laugh now. A kid with reading problems being handed a brochure - it's like kicking him in the face. It represents double failure.
If an ASD kid is successful at something, they are likely to take well to the activity. Failure in reading is a big turn-off, and he'll continuously reject reading for that reason. The young person needs to develop the skills that lead to improved success in their school work. I would also caution you on methods that may or may not produce instant results. It's like knowing that a child wants to eat a certain food, but you don't know what that is. Your only choice is to try different foods until you find the right one.
This advice comes from my own experiences dealing with reading and writing assignments as a youth. Eventually, I found a balance between reading, answering questions, doing the assignments asked, and knowing how to use a dictionary when I didn't understand vocabulary. I believe that ASD kids need to be aware of methods to help them get through the stages of learning. Kids don't know to ask if they don't understand the text. They don't want to look silly or encourage ridicule.
If possible, make your interaction with your son on school matters a daily conversation. Read for him, with him, and have him read to you. You are building confidence through applied skill ability. He'll also feel better at school having done his homework well. He'll be ready for anything and his enthusiasm will increase.
I'm very glad that you are seeking help for your son. I suffered for many years experiencing failure and frustration because I didn't know there were methods used in reading comprehension or writing. Others seemed to read and grasp everything instantly. When I wrote, my sentences were childish and without descriptive vocabulary. Like your son, I have had a "zero" given to me many times. I hated bringing those home. I wish I had had someone helping me regularly overcome my deficiencies. For both parent and child, the effort is worthwhile. I think it counts as quality time. I wish you a lot of luck. Enjoy all the stories you and your son can explore together.