I did so many of these. Yes it's a excellent resource

Is it pounced “oil-er” or “yoo-ler”?

I did quite a lot of them maybe 10 years ago. Are they still being updated?

Project Euler is the lifehack for job interview prep.

Find problems that are appropriate for your skill level, write out answers on paper or on a whiteboard, then once you're happy with them, put them into the computer and fix them up until they run. Keep doing that until you feel well-practiced with your ability to put code together without having an editor and think quickly about new problems you've never seen before. (For me it took a few days of practice.) Congratulations, you're now the guy or gal who can show up and eat the interview problems alive and look comfortable and confident doing it.