Congrats! Welcome aboard!!

"Excellent advise! This company really de-emphasizes systems knowledge."

The company nor the training department de-emphasize systems, they don't want you to be able to build the aircraft, but you will need to know systems, controls and indicators, memory items and ops limits. The systems aren't hard, but you will have to have systems knowledge for the Oral, for the type ride and for subsequent PCs.

That being said, the training department will teach you, not hand feed you, but will teach you. Flows (including checklist challenge and response verbiage), ops limits and memory items are what I'd study.