My 6 YO son is in kindergarten in an "accelerated" class. He is a pretty proficient reader, but lately the books coming home are 2nd grade books. He can read them but the assignment is also to retell the story, and with 30-50 pages in a book he is struggling and we are all frustrated. Is it developmentally appropriate for a 6YO to retell a story that complex? If so how can I help him retain what he's reading? He says he forgets the beginning by the time we finish.