There are 2 rounds,
*Aptitude Test
*HR Interview
Aptitude Test:
It is very simple and easy, because they only ask the general questions and simple grammar questions, so if you prepared those topics definitely you will clear this round.
HR Interview:
This round is very easy, because they only ask tell me about yourself and some times they ask about your qualifications and family background details(these are asked to checked your english speaking ability), that's it for HR Interview.
They only need reference! If you have refer in this company definitely you got a job you don't need a skill or knowledge, otherwise you faced some difficulties