Beware of getcracked.io scam
Sites like getcracked.io are pure scam. It is a garbage expensive platform for quant interview preparation advertised as "master c++/python/operating systems/concurrency" which are best covered cheaply or free through textbooks as mentioned in this video.
Most of what you need for quant interview preparation is available for free. Going through a textbook rigorously is a much better way to prepare for C++/OS/design patterns and other topics for quant dev interviews than doing MCQs. The only exception is algorithms-for that, you have Leetcode (again, mostly for free).
For trading and research roles, brainstellar/openquant/zetamac/leetcode/greenbook etc are freely available and sufficient.
TLDR: Please avoid such sites and save your money. Upvote so that other people know about it.
For getcracked bots (and bots from other similar paid sites) reading my post: I will keep posting this regularly on multiple subreddits so that a good chunk of quant aspirants become aware of this and don’t spend money on your garbage :)