Hi C,
Thanks for the question! A few thoughts that might help:
1. We talk about conditional reasoning here and on our blog very frequently, and so there are a ton of places you can go to learn more about diagramming. It's also a topic you'll see in both LR and LG a lot, so it's good that you are asking questions now about it! Here's some articles/threads to review when you have time:
2. "For line 3, either the January tickets or the February tickets, but not both, are green." — On page 4-111 it shows that we've made the diagram
directly inside our setup, by shows a G/ alternate on Line 3. Technically, one and exactly one of those two months will be G for Line 3. Since Line 3 is next to Line 2, the two interact, but it's still possible for Line 2 February to be G, but that would then mean Line 3 February could not be G. For example, look at the setup to question #20 on page 4-112: it shows Line 2 as being G.
3. "R is not scheduled for Thursday unless L is scheduled for Monday" — You should use the Unless Equation here (page 2-13), which produces a diagram of R
Thursday L
Monday. More on handling Unless here:
https://blog.powerscore.com/lsat/bid-28 ... -equation/
lsat/viewtopic.php?t=13220
4. Last, there's a specific section of the forum for each course, and in this case yours can be found at
lsat/viewforum.php?f=25. Each lesson and homework has it's own area where you can ask question specifically about course material (and as you might expect, many questions have been answered already)
Please let me know if that helps. thanks!