New As Levels. So many mistakes. Questions about new OCR Spec.

Don't they proof read half this stuff?

So, just one question today. What are gill plates?
The specification says they are gill lamellae, the textbook says they are stacks of gill filaments, and the revision guide says they are gill lamellae.
So, do i follow the specification + revision guide or do i follow the textbook?

New A-Levels ahy?