@(you need an account to see links)
I was a biochemistry major and then worked as a high-school/college level tutor (all subjects) for a year before starting the job I'm at now.
Let me know if you ever need any help. ^_^
I'm not sure I'd have the time to commit to anything solid and regular, but I'll always be happy to try and explain things if you get stuck (given that I hopefully haven't forgotten everything either )