You should definitely leave AB.1 until later!
A.8 uses a fun trick. Focus entirely on how you could get the block on the right platform to the left platform.
For the button between B.17 and B.18, you're doing the right thing and extracting the left block is definitely harder. In fact, it's a similar process but with more steps.
The button next to A.2 requires some assistance from outside the puzzle.
