I applied in mid-November and got the invitation for the online psychometric tests, which I happened to pass (not very tough, but do not guess, if you are unsure, just leave it because it affects your overall percentile). Moving on from there, my application was screened from HR and got selected for the assessment centre (1st week of January 2017), so I was waiting and after 3 months I got the assessment centre invitation. Don't worry if you haven't heard for long, cause they will call.
On the assessment centre day, it was 12 of us. Everyone was nice and friendly, especially the assessors make you feel very comfortable and the hosting ladies are extremely nice too. Make sure you approach each and everyone you meet and have a few words with them, ask about their daily routine, how they got in, etc.
Talk to the other candidates and get to know them, because you are not competing against them if everyone on the day meets the standard, everyone will get an offer. Six of us had to do the personal presentation first followed by the numerical reasoning test. The personal presentation is the most difficult out of the four. You really need to explain why you want to join RR and draw on real life situations when explaining your competencies. Also, smile all the time, they like it and makes you less nervous when they smile back.
On the group activity, we had to build paper aeroplanes, have an eye on the time and follow the instructions very carefully. There was one member in our team who was trying to control everyone, not sure how the assessors took it. Make sure you speak and contribute in some way. At the end you need to present what you did, at the end of this, they will ask you questions like "how would you have done something differently?:, make sure you answer this question even if someone else answers, just add something, they note it down.
The technical interview - people say it's difficult but not really if you're a very technical minded person. Basically, if you are asked a question, which sounds very unfamiliar, apply your principals and make sure you say something without staying blank/lost, they like it and tend to support you when you do this.
Networking is very important, do speak a lot. It's important you leave a good impression, cause at the end of the day they all sit down to talk about the candidates. All the best!!!