I've done 200+ problems on leetcode, all of ctci, and lots more. Hundreds of hours of prep over the last 5 years. Never received an offer from FAANG after 10+ on-sites with them. Know others with similar experience. People I know who get offers are even more aggressive with prep but also get lucky. (As they sometimes get rejected even when they've received an offer from the company before...)
I've done 200+ problems on leetcode, all of ctci, and lots more. Hundreds of hours of prep over the last 5 years. Never received an offer from FAANG after 10+ on-sites with them. Know others with similar experience. People I know who get offers are even more aggressive with prep but also get lucky. (As they sometimes get rejected even when they've received an offer from the company before...)