First round was with HR rep and was about past experience , it was basic chit chat. 2nd Round was over the phone on an IVR, they check your pronunciation and listening abilities. 3rd round was again over the phone but with a Voice and Accent Trainer. 4th round was On-line aptitude test multiple choice answers. 5th round was a written test for email writing abilities.
If you clear till 3rd round 4th and 5th rounds are formalities that you have to do.