Samsung Electronics interview questions

There are a lot of stages I only got the first interview stage and haven't heard back since. The online assessment is quite straightforward but I was not ready for the first interview. It was only a phone call supposed to be 30 mins but stretched over to 1 hour, I would highly recommend revising some key topics as although its a competency interview a lot of technical aspect is already being tested on - these included a detailed understanding of waves and interference and how the CPU's worked in general. The guy I spoke to was Andrew, nice lad but very tough.

Samsung Electronics came to our college and although job description clearly mentioned that they require html, css, js, react(that too optional) they asked angular js. in both OA and interview