Do not study the SOPM flows
Do not study the gouge floating around
(Gouge is on outdated system loads)

If you can get ahold of a cockpit poster
then familiarize yourself with where everything is (especially guidance panel)

Study basic 121 regs
Read over all the basics you forgot in the Everything Explained book.

Study up on basic jet aerodynamics and high altitude stuff.

That’s more than enough to keep you busy!