Originally Posted by
truckflyer
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.
There is one important aspect in line training many people seem to overlook: what is to be known, and what is to be known where to find the info.
Line training is "operational" training: learning to operate your aircraft, and operate as a "second in command", able to take over if there would be a case of pilot incapacitation. So learning to operate under time pressure (flows & procedures, takeoff, climb-cruise-descent management and be able to land). FCOM and OM-B SOPs, limitations, memory items, failure management is stuff that is to be known without looking in books as they are important for the cooperation in a 2 man cockpit environment where each pilot has his own responsibilities.
The OM-A chapter 8 is not the target in line training. It is a reference document, it will "resurface" during preflight occasionaly. It gives a good impression if you can work along with your training captain, but you will never be left alone on these subjects. It becomes more and more important to understand the document when you start to prepare for the left seat.