What is the exposition for Heartbeat by David Yoo

a boy named Dave who tries to change his appearance, but comes across a big problem that hurts him physically. He has to decide between pretending to be someone he's not or revealing his true self to his friends and crush.

Explanation:

depends on your school

when i was in high school i took ap biology my senior year and it was the hardest one for me because my teacher finished the material within the first month of school and then went on to doing advanced college level it was horrible. but at a nearby school ap biology was one of the easier aps. also, it depends on what you are interested i like math a lot so ap calculus was easier for me than most but i hate history so ap us government was harder for me than most.

a low four-wheeled open carriage of a kind formerly used in russia.