Are you the very best chess player in your state? Then you're the tops. Something or someone that's tops is outstanding or of the highest quality.
You can use the informal tops to describe things or people that are unmatched or topmost, like your amazing high school, considered to be tops among all public schools in the country. It can also mean something closer to "awesome," as when you say, "Did you taste that new flavor of potato chip? It's tops!" Tops first appeared in 1935 as American slang.