It's possible that that much neglected resource,the
Public Library may have some or all on the shelves.
I bought a used set of Trevor Thoms, The technical stuff I lapped up, Human Performance also presented few problems.
Weather ,well, I toil still,with some of the concepts and likewise Nav can be tedious. The basic bit is easy,the corrections and calculations tend to highlight my poor maths
Then we hit the dry-as-dust Air Law....you just have to stick it on the bedside locker and spend a half hour every night.......by the third reading, some will be familiar
...keep at it!
Now the kicker! I am not a pilot , have never taken a formal lesson and never handled an aircraft in flight, honest guv.......but I have tried (and passed) some of the free on-line mock tests.
Nobody is stopping you from taking the initiative and teaching yourself the theory. Apparently, the Flight Sim enthusiasts are good enough to fly a real plane.....no instruction whatsoever.....I also understand that the Wright Brothers struggled in this respect as well, so they also went the "self-instruction" route, without the benifit of a Sim.books or a computer.
You have an instructor, whom
you pay to teach you. the more you do for yourself, the more time the instructor willhave to teach you the unwritten skills and tricks that will help you make the most of your time gaining a Pilot's Licence. good luck and get reading!