Are you going for it? One of the toughest ACs around, so due preparation is necessary. Having said that however, just be your self, a more prepared self that is.

This information may be outdated(~2 years), but unlikely as the segments in a Shell AC is quite standard, and would likely not change.

1. E-Tray Assessment
You would be placed in a scenario, involving a Shell Project in a fictitious region. Before the assessment begins proper, you would be given some time to read information regarding the project itself.

Following which, you would be given 30 minutes to respond to 12 emails using their E-Tray software on a laptop. You respond to the email via MCQs. Some emails only arrive after certain emails are answered. As such, speed, accuracy, and the ability to find information fast is necessary.

After 30 minutes, you would be given a blank page, and 20 minutes to craft an email to answer a question. Similar to above, the ability to distill main points and present information is imperative. Point form is sufficient.

2. Group Case
Similar to all other ACs, you would be placed in a Group Setting (6 people typically) and undergo a Case Scenario together as a group. Just remember to speak up, and with valid points at that. The ability to build on someone's else points is quite critical. Oh, and remember not to put down anyone.

3. Self-Reflection Interview
A rather unique segment. Basically as the title implies, they would ask you questions pertaining to the E-tray as well as the Group Case i.e What did you do well? What did you not do so well? If you have some lull time between segments, try to undergo self-reflection so as to prepare for this segment.

4. Individual Case
Probably the hardest segment. It's either you have what it takes, or you spend 30 minutes trying to ******** your way through. You are first given 20 minutes to read a case, following which you would have 5 minutes to present your solution to the interviewers. After that is a 25 minutes Q&A. The key focus for this segment is not your solution, but how you arrived at it. As such, the interviewers would deep-dive into the particular solution you presented, so as to understand your reasoning and train of thought.

5. Individual Competency Interview
Nothing too fancy, similar to the first-round interview. The last and probably the easiest stage.

Shell AC is a very draining day, but the feedback they give is quite detailed as well. Treat it as a learning opportunity. You aren't competing against the other candidates, but against a standard. Have a good night rest and just go as prepared as you can. Goodluck!