OM-B you need to know inside out.
OM-A chapter 8, again know it inside / out.
The 2 above are the most important, the ones below you should have been well familiar with during your TR. Depending on company they can still ask you some obscure questions from the FCOM, but this is more about you being able to find the information in the FCOM or FCTM.
FCTM as reference
FCOM Limitations, and various Procedure chapters there in the FCOM.
I would read them in that order.