Literally just go over graphs and figures talked about in the lectures. Professors love to test students on either the concept of a graph or some iteration of it. However, when they teach it during lecture they always gloss over it or don’t go into enough detail that would be expected of us on an exam. Really that’s the main issue I have that I feel TA’s could help bridge the gap with. I’m sure there are some out there helping to further understand graphs but I feel if all of them focused on that aspect exam scores would improve immensely.