The biggest risk in resitting an exam that you've already passed is that you'll fail it. That could jeopardise that exam's pass.
Also, it's time wasting. You're better off concentrating on your IR or something more useful.
Your exam marks are only mildly interesting to your first employer. What is probably more important at the low hour stage is how you did in your IR. After that it's experience.
The most important quality you need is to be able to convince the recruiters that they can put up with you in the FD for 6-8 hours without wanting to kill you.