What's the difference between the first and first?

After taking notes carefully and studying freqently, derek not only passed the test, select the word group below that best completes the sentence in parallel structure. and he got 100% but he scores well on classwork but he also scored the highest in the class and he was also scoring the best he ever had

They always say that juvenile delinquency is a problem. a.)them b.)everyone c.)a noun

Hi how are i have some questions about english subject can you answer for me ?