Would I be able to resit my Science exam?

I've done my first exam for the OCR Science Gateway B, however I've felt like I didn't do really well, I'd guess a C, which is definitely not what I want. My next exam I am prepared for as I have a good textbook and know everything there and should be able to at least B, maybe A. I've also done my controlled assessment earlier on this year which I don't even have the result for.

If I am unlucky with the grade I receive in August, would it be possible to resit the exam? Would I have to resit both or is the first one possible? I cannot find the information exactly, so help would be appreciated. Also, when do they do resits and would it be best to ask my Exams Office?

Thanks.

I would strongly suggest asking your Exams Office, as it will be the decision of your school as to whether to put you in for a resit or not and they will be best placed to answer your questions