Hmm, started my break today--unofficially 🙂 anywho, back to your question. Honestly, it all depends on your level of readiness and how you decide to spend your break. I would say that if youre well prepared the process isnt so nerve racking but it's easier said than done....Im sure some of us have been in situations where we prepared thoroughly but had a poor showing. With that said, I'd say go for it and use the momentum to get it done (just my opinion and what I'd do if I were in your position...doesnt mean you ought to). But if you can schedule a different day and think is best for you.....that would work too.
Good luck w/ your exam and interview...