Class A or Class 1 = "Let's bully Class E as we are the highest and most snobbish students in this whole entire school!" Or "Class E is so dumb/stupid/yadayadayada!" And so on.

Class E F G H I J K L M N O P Q R S T U V W X Y Z or Class 3-10 = "Let's study and defeat Class A so that we can prove that we're smarter than them and to gather more friends!"

Class B C D or Class 2... = "Sorry, but we have better things to do other than bully/help you." Or, "Let's help Class A to gain massive popularity even though we still don't have enough screen time!" Or, "Let's bully Class E because we are more superior than them! HA!"  And so on.

Anime: Assassination Classroom