Please help.

I took the SAT recently and I realised later that I bubbled my last name in the first name slot and my first name in the last name slot.
Will this mistake affect my score?
What should I do?

Contact College Board ASAP

Yes I did, they’ll reply to my query in 3 to 5 days.

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Closing thread. The definitive answer has been given. Nothing else to say. Good luck