Should I be concerned?

[psyxwar]

I will do that anyway. Some people have said I should be aiming for a 45 in Biology instead of a 40, but since I've only started it's difficult to gauge just how good I am at the subject. :S If that ends up to be the case, then I have little to worry about.

Aim high. I mean, it's better to aim high and fall a little short, as opposed to setting your goals low so they're easily met. Of course, if you do find yourself doing poorly you might have to readjust your expectations later on, but at this stage there's nothing wrong with pumping yourself up and striving to get the top marks.