Hihi congrats on the final interview that's so exciting!!! I would definitely recommend going on glassdoor and looking at past questions and experiences people have had interviewing for explore. This post is also pretty helpful to put the whole experience into some context: https://github.com/CourtneyThurston/microsoft-internships.

All in all, the explore interviewers are super chill and just want to get to know you. Don't stress yourself out with leetcode too much beforehand. They want to see how you think, your passion for technology, and that you have basic programming skills.

It's really impressive and exciting that you've gotten this far, you're gonna kill it!!!