Dell Technologies interview questions

Applied online and got the phone interview a week later. The interview was pretty straight forward. The interviewer first asked me to evaluate my skill of C++ from 1 to 10. Then asked me some question about data structure and my project. I did a bad work, but the interviewer keep encouraging me and leading to the answer. Even though I made a plenty mistakes, he kindly told me the answer.

the hiring process began with a written objective type aptitude test , followed by 2 technical interviews ( included puzzles apart from questions on project, C, C++, JAVA ) and a final HR Round. There was a gap of 5-6 days between final and prefinal round.