This is the 2344th most frequent Japanese word.
ますます
"Increasingly" or "more and more."
In this sentence, ますます is used to express an incremental or progressive increase in the intensity or degree of the state of 'knowledge becoming rich.'
本を読む習慣がついたおかげで、ますます知識が豊富になりました。
Thanks to developing the habit of reading books, my knowledge has grown even further.
Here, ますます indicates a progression of nervousness intensifying over time as the exam date approaches.
試験が近づくと、ますます緊張してきました。
As the exam approached, I became increasingly nervous.
In this context, ますます shows continuous growth or enhancement, this time in terms of someone's popularity.