This is a very resourceful group while you study for the OAT, and it’s free! I recommend signing up for two reasons:
First, if you ever have a question on a scientific topic, practice problem, or something about the OAT, it’s very likely that someone on there will help you out.
Second, you can help out other people with their questions. You remember 10% of what you read, but 90% of what you teach. Even if you don’t know the answer to someone’s question, look it up and explain it to them. You’ll learn something new, it’ll stick with you for a long time, and you will have actually helped someone else out.