I have applied though employee referral , If you give interview through employee referral the chances of getting hired will be more, so ask employees in linkedin to refer after referral you will get call from hr for interview, the interview will be neutral, first they ask tell me about yourself and then about project, basic electronics, basic electrical, don't forget to learn about Logic gates it's very important than plc ladder logic basic then important question is why cotmac , why automation, study basics perfectly