Bella doesn't really need to do any studying, between eidetic memory and cognitive speedup; no one is expecting original insight from a freshman and she's not trying to stand out that much. She'll let Bridget steer the study session as much as she can without being conspicuous. (Having a study session at all instead of just hanging out with Bridget recreationally is also to be inconspicuous. It helps a little that Janine's going to be around to witness the "studying".)