Blackstone BAAM interview for Operations and Finance Internship

Hello everyone, I'm currently in my second year at a European target uni and I have a phone interview with Blackstone for BAAM in Operations and Finance for an off-cycle internship in London. I've heard operations interviews are not as tough as more front office roles but what sort of questions should I expect apart from fit or behavioural? The whole interview process wasn't specified, but they told me that since I'm not in London at the moment that I can't go through the full first round interview (which includes an analytical test) so they'll start with a phone call first next week.

I was speaking to my friend who's doing her summer internship in Operations at Barclays and from what she's told me her interview process seemed a lot more rigorous than what I was expecting for the operations division. Obviously Blackstone and Barclays aren't the same but she told me she had a case study interview etc, lots of analytical tests. If anyone has info on how the full interview process works at Blackstone I would very much appreciate it.