Develop your own list
Develop your own 'Knowledge List'. It's better done over a period of time, but decent template could be produced in one or two self-brainstorming sessions. A good starting point would be the Company LOE or equivalent (Supy/Observer?) form. If there's time then a briefing from a friendly pilot slightly ahead in the list would be good before every series of flights. It's useful to know which 6 charts you might invariably need to use out of the 65 terminal charts for airport XXXX. Going through the motions of making your own 'route guide' helps, even if you do not ever look at it again.
Learn to use your documents well, if you don't know it, fine, but if you cannot find it in 3 minutes flat, that's a no-no with me. And then there's electronic documentation . . . a whole new story, yet to find an ending.
Topics could broadly be along the lines of:
Airplane Type SOP, non-normal/abnormal/emergency 'memory items'
Limitations
Variations - RW change at the last min for T/O or Ldg - have your own memory jogger or 'chklist'.
Dep Dest and their Alts (+enroute too)
Peculiarities of route and Alternate Airports (which you may never really visit- terrain, unusually higher minima, One way RW, lack of ILS approaches, to name a few)
ATC procs
Special Ops and others: RVSM, MNPS, PBN, TCASII - from a line flying view
Emergency procs, memory items, ATC-emerg procs
A good geographic orientation - awareness of ETP
Ops Manual Part A - review of Company Procs - (guaranteed to promote slumber but this doc v v important) - such as AOM (aerodrome operating minima's), AWO (all weather ops as applicable to you) - DTLs (Duty TIme Limits) etc.
The above is just to point you in the right direction and by no means exhaustive. A good method is to keep a pocket notebook or notecard (or smartphone) handy and note down every relevant item that comes to mind.
And like many a wise person has said throughout this discussion - take yourself seriously but only just, rest up well, and do not overload yourself - all that Captain or Trainer is looking for is that you know what you're doing and you're self critical enough to realise where you have to work up.
Cheers!