Amazon Software Developer - Internship interview questions

Sent in my resume, within a month they responded to see if I wanted to take a test. Took a total of three tests administered across two days. If you pass the first one, you get the second two. I believe two were programming related and one was logical reasoning. Straightforward, simple and not out to get you. I passed with a good score (probably) and got an offer right away.

I apply through campus career fair. There was one test(?) and one interview. The test is pretty easy and i passed it. After couple weeks, i got email informing me a phone interview. The interview was easy, about some data structure, hash table, binary searching algorithm, etc. But i messed it up with lack of preparation.