Ahh okay, the same thing happened with two of my maths exams. It all depends on how flexible your school is. If they're quite nice, you can either take both exams at your school and just pay your school to enter you for the exam, or you could sit both exams at another centre and tell your school to just transfer the entry over to the other centre.
What I had to do (because my school are pricks) is find a centre which was willing to let me do the exam in quarantine. So, I had to sit the exam at my school, be escorted of the premises, be driven to the other school and sit the exam there all under supervision. Luckily, the school I found had the NICEST head examiner who basically just said, turn up when you can and you can do the exam. He didn't even charge me to sit the exam, he said 'the government pay the school anyway' so I don't need to