You are lucky that your instructor has given you a clear set of criteria for your paper. What you need to do is to decide what makes a good young adult novel. To do that, you can think about the best young adult novel you know and ask yourself, "What makes this good?" Actually, that is an excellent way to find the criteria of anything. Here are some possible criteria that I can imagine for this topic:
Keeps the reader's attention.
Has themes relevant to young adults.
Addresses problems that young adults care about.
Has interesting characters that seem real.
Has an interesting end that makes the reader think.
After you have come up with your own set of "things that make a great young adult novel" you can look at 1984 and evaluate how well it does those things. In organizing your paper, you can use one criterian per paragraph and then give examples from the novel to show how well it meets that criteria.