Subway Girl by P.J. Converse.
The best part of Simon's day is riding the train and the possibly seeing his crush. Simon's classmates call the mysterious girl -subway girl. Many of the guys try to guess at her story. Simon keeps is distance from his classmates and his feelings to himself.
One day Simon gets into a conversation with Amy, his crush. When they start talking Simon wishes his English was better. Amy has recently moved to Hong Kong and though she's Chinese doesn't speak much of the language. Simon is in the very last English level at school. The two manage to make the conversation work.
The chapters are split between Simon and Amy. The characters felt underdevolped, Simon was the strongest of the two. Overall Subway Girl felt flat. Simon and Amy's stories weren't cohesive. It was as if the chapters were put together as opposed to written together. The secondary characters were simply there and didn't add to story.