Newman needs to deliver mail so he can get transferred to Hawaii. Although he and Jerry are sworn enemies, Jerry offers to help him deliver the mail so that he will move away. Both individuals will benefit from helping Newman.
The principal gave a speech comparing the two groups of students that were present, one who gave up on their future while the others are still in school. He wanted to motivated them so they feel that they are not less superior in society and the first thing they would have to do is pass the exam.