I will snowball off of the skipping topic - when I forgot to skip and get too preoccupied with just solving, I do significantly worse (-5 extra avg per LR section.) Its something you have to really train yourself to do, but I think is super beneficial.
@chrijani7 On the topic of habit, it may be helpful to start waiting until after section 3 to take a break, as you won't get a break until then on the real thing. Also, going to the bathroom (and eating a snack) during break are allowed.