I received an e-mail from a recruiter. One of the employees referred me for summer internship. In the e-mail, it says that I should review algorithms/coding etc.. So, I reviewed basic algorithms for a day. I had 2 phone interviews with the engineers. They were on the same day, 45 minutes each. They were highly technical. No algorithms/coding questions at all. All the reviews I read was mentioning those kind of questions, however they didn't ask me that kind of questions.Instead, they asked questions like " how do you calculate the power of a server?", "what is OS?", "what is scheduling?".. etc. It was hard, and I couldn't do well.