everyones going to spend different amounts of time on each section. however, there isn't a lot of thinking involved with reasoning out the angles, thus I feel that the least amount of time should be spent here.
if I had to rank the amount of time spent on each section 1-most to 6-least
(1/2) keyhole/TFE
(3/4/5) cubes/pattern/holepunch
(6) angles
for those of you struggling with pattern folding, realize that some distinctions are very easily made to eliminate answer choices, instead of folding the pattern mentally and then checking if the answers follow, I suggest doing the opposite which would be to see if a particular answer is possible given the question. Many times the largest side will have the incorrect print or the most obvious fold will be messed up.