This is the 129th most frequent Chinese word.
甚至
"甚至" means "even" or "to the extent that."
Here, '甚至' introduces an extreme example to emphasize the degree of his effort.
他学习非常努力,甚至通宵复习。
He studies extremely hard, even staying up all night to review.
Here, '甚至' is used to highlight an extraordinary extent of the highway's length.
这条高速公路很长,甚至跨越了三个省份。
This highway is very long, even spanning three provinces.
In this example, '甚至' serves to stress the significant impact of her achievement.