Happy to help here.
I've not only worked in Agile on the ground (project lead, scrum master, dev lead, etc. on IT impementation projects for 4 years) but also led organisation-wide Agile at Scale initiatives from the strategy consulting level.
Unfortunately, there are not a ton of resources for Agile/Scrum master interviews specifically. You should not expect interviews like those for strategy consultants (i.e. no cases, no market sizing, etc.). You will be very much tested on your content knowledge and your answers to hypothetical situations, brainstorming. etc.
Your best bet is to ensure you're really a domain expert here.
I'll save the space on Agile resources themselves...a quick google brings up so much information.
I highly, highly, recommend you hire a coach for roleplay. Nothing beats being asked real interview questions live, having to react, and then discussing how your answers could have been better.
As you may guess, I can support with this. Feel free to shoot me a message if interested....regardless, best of luck! :)