I ordered Exoplanets from Sara Seager, and it's a little over the level of high school science olympiad. I think I'll rely on other sources now.
Heh, I actually met her...fun times getting neat guest speakers. But yeah, I believe the textbook discussion has been explained a bit at least for this year's topic (summary: they can be eh because of how modern the topic is). I'd imagine from her talk and how she's relatively well-known probably the textbook is pretty good, but I don't have it/haven't read into exoplanet textbooks. But as said before, there are multiple sources online that should keep you covered for sure. And if you have trouble with, say, planetary equilibrium temperature, we can all try rederiving that and explaining it again like last year...
B: Crave the Wave, Environmental Chemistry, Robo-Cross, Meteorology, Physical Science Lab, Solar System, DyPlan (E and V), Shock Value
C: Microbe Mission, DyPlan (Earth's Fresh Waters), Fermi Questions, GeoMaps, Gravity Vehicle, Scrambler, Rocks, Astronomy
Grad: Writing Tests/Supervising (NY/MI)