Amazon Internship-Software Engineer interview questions

Give a rusume in career fair, after a week got an email for code challenge. The first code challenge was timed. Also it was two parts, one was math part and another was English part. I finished both, and after a few days got another email with another code challenge but this time was two questions also timed. I could not pass the second code challenge.

I was given an IQ test followed by 7 easy debugging problems. They were all easy, most of them are just changing one or adding brackets here and there. Than I got a coding assessment and then final phone interview. The phone interview went really well the engineer even said "Oh that's good, I like that" to one of my marginal optimizations. I thought I got it but I received my rejection about 2-3 weeks later. The process is very time consuming, the recruiters were very difficult to reach and unprofessional, I am disappointed with Amazon.