In interview, interviewer asked the questions in detailed. Your concepts of specific subject should be clear. You may have to solve some numeric question during interview. If your concepts are clear then interview will be easy.

It was a one hour process. I was asked question on my subject. the interviewee was very helpful and supportive. they also check you communication skills and interpersonal skills. you have to fluent in english. you should have a basic knowledge on your subject.