for BR try writing out why each thing is what it is, you picked A... why? why not BCDE? dont just understand the right answer and move on bc there are often great trap answers that you think you understand why its right but you have no idea.
I think I would avoid the addendum bc it did not really interfere with your ability to take the test or mental state for the test itself, just backtracked ur studying a bit (from what Im interpreting that as)
Scores come out closer to 3 weeks than 6 (Dec 6 test came out on New Years) IMO it doesnt make much of a difference bc they wont look at your application until you have a score.
... studying, eventually it becomes easier bc you are used to it ... , at first it is weird bc you don't feel ready ... for bed by then bc you're normally up much ...