Concentrate on the essentials initially ('must know' stuff) then as you gain experience add the 'should know' and 'nice to know'.
This seems to be great advice. You seem overwhelmed and all over the place. Narrow your focus to the essentials, let the other stuff fall into place. One day, the pieces will click into place, and the logical progression will make sense, and so will all of the bits and pieces of knowledge you have accumulated.
Ask a lot of questions, that is good. Appearing to have a lack of confidence, or too much confidence, not good.
I had an excellent instructor in the sim. After a few, what I thought were excellent approaches, the instructor suggested the procedure on full motion. Great I thought!. Unknown to me, he had the tech add a 30 kt crosswind and an iced runway....result....teeth rattled and a balked landing...
learned that you always are learning.