Like others have said, good intentions, not so good application.
Just learn what the company wants you to know, and how they want it taught, and you’ll fine.
The company over years of operations has refined what you need to know to make you an effective element of operations.
The FCOM goes into way to much detail and is really more of an engineering doc than crew manual.
Admire your enthusiasm, but throttle down some, wait for class.