Welcome to the King Air. It’s a fabulous aviation appliance and you’ll love it. I did KA300/350 at the same facility in December 2020. Instructors are extremely knowledgeable on systems and know exactly where to focus. You’ll get more than enough sim time, and you’ll know everything that’s going to happen on the check ride before you get there. If you haven’t done turbine engines Or pressurization in the past I would recommend learning about how those systems work in a general sense before you learn about the specific systems. If you’ve never used a good autopilot or FMS, drag your butt to the training center on the weekend and work on procedures in the flat panel trainer.
Good luck. It’s a fun, forgiving airplane, really.