Man! And here I am after 8 months failing to invert a Binary Search Tree or validating a Binary search Tree without much luck. Time to hit leetcode I think.
Not sure how you could go 8 months and fail problems like that. Maybe after a month or two you should have focused a bit more on what the interviews are looking for...
The new generation are frankly idiotic in how they do tech interviews, which were already not great. Google and Facebook made this situation much worse. It has become a meme.