Dont worry. Carigali is lacking people. And they are trying to get non-bumis to join them too. So just answer as best as possible. And be honest, just admit if you dont know any of the topics. You have only 2 years exp so I think they are looking for fresh faces to start their career with the company.
I think the problem is not trying to join them, but to continue working there. Office politics, getting transferred to outside KL, etc. is more challenging. My two cents only, but good luck ya?