I think it's the depth of character development through the letters. How the characters reveal themselves and grow over the course of the correspondence is crucial. Also, the themes explored in the letters matter a lot in reaching the core.
Well, the ending of 'When You Reach Me' could be significant in a test when it comes to analyzing the author's style, the resolution of conflicts, or how it reflects on the story's beginning and middle. It all depends on what the test is focused on evaluating.
Well, mystery novels in this context often have hidden clues and red herrings. The setting might be mysterious too, adding to the overall atmosphere. The story usually builds up tension gradually until the big reveal.
Well, 'When You Reach Me' was deemed historical fiction as it portrays a period in the past with its unique social and cultural context. The timing of this classification likely happened when literary experts recognized these elements and assigned the genre.
The science fiction elements in 'When You Reach Me' often involve time travel and mysterious messages from the future, creating a sense of wonder and intrigue.