I spend 2,5 month preparing every workday additional an hour and in weekends 10-15h (the whole weekend). I failed the first phone interview because I was absol

I spend 2,5 month preparing every workday additional an hour and in weekends 10-15h (the whole weekend). I failed the first phone interview because I was absolutely unable to guess what he was looking for. 2 years later again 2,5 month preparing for it. This time also large system design. I make it to inside. I still not in. It is emotional stressful. That's how it is.