Hi Anonymous,
LOMS is a useful material to get more insights in how interviews are 'feeling' in reality - at least much more than written cases can give you.
It's a nice complementing material and also somewhat entertaining to listen (especially if you have any first-hand MBB interview experience) - but it won't make you a case-solving veteran either.
Instead of spending too much time on theoretical prep, most candidates are more successful in reaching out and doing real-life interactive case interview prep, ideally from time to time with a professional coach who guides you to learn the correct case interview skills right from the beginning (yes, unlearning wrong habits is usually more painful than getting it right in the first place, and blind usually not the best leaders of the blind...).
Hope that helps - if so, please be so kind and give it a thumbs-up with the green upvote button below!
Robert