はクラスの誰よりも

more than anyone else in the class

→ は
phrase Rare #31,876
more than anyone else in the class Used to compare someone with everyone else in their class, meaning they do something more or better than any other classmate. The は marks the person being compared, and the phrase is usually followed by a verb or adjective.
JA: ミカはクラスの誰よりも歌がうまい。
EN: Mika sings better than anyone else in the class.

彼女は音楽はクラスの誰よりも優れている

She is better at music than anyone else in the class.

英語を話すことで彼女はクラスの誰よりも勝っている

When it comes to speaking English, she is better than anyone else in the class.

トムはクラスの誰よりも勉強している

Tom studies harder than anyone else in his class.

はクラスの誰よりもずば抜けて背が高い

He is by far the tallest person in his class.

トム理科はクラスの誰よりもできる

Tom is better at science than anyone else in the class.

彼女はクラスの誰よりも歌がうまい

She sings better than anyone else in the class.