Their interview questions are pretty basic and the whole product is pretty much useless. Waste of time and money.
LeetCode - Practice and level up your development skills and prepare for technical interviews.
Google Play Books - Google Play Books lets you search, preview, and buy millions of books using Google Book Search.
HackerRank - HackerRank is a platform that allows companies to conduct interviews remotely to hire developers and for technical assessment purposes.
Amazon Kindle - Amazon Kindle software lets you read ebooks on your Kindle, iPhone, iPad, PC, Mac, BlackBerry, and...
Daily Coding Problem - Get exceptionally good at coding interviews
LibriVox - free public domain audiobooks