Interview (OA, actually) scheduled at Mercari, JP

This will be the first time I sit for an OA!

I have an OA in 6 days. Not a lot of articles/ posts on the internet about the kind of questions they ask. The email did suggest me to try and solve 100% of the questions and focus on code quality. Anyone who's given the OA for them in the past or is a current employee of the firm, please share some insights to help me better prepare for the assessment. Anything about the topics they're known to ask or level of difficulty as per leetcode standards would be immensely helpful.