This is the 48th most frequent Japanese word.
より
"より" means "than" (used for comparison) or "from" (indicating a starting point).
Here, 'より' indicates comparison, showing that the level of difficulty of the current problem surpasses that of the previous one.
この問題は前の問題より難しいです。
This problem is more difficult than the previous one.
In this sentence, 'より' is used to set a comparative basis, suggesting that my arrival time precedes hers in terms of earliness.
彼女より早く到着しました。
I arrived earlier than her.
'より' in this context expresses a preference or prioritization where one option is chosen over the other.