AS Results - Help please

I just got my AS results (AABB) and I was one mark off an A in edexcel Government and Politics

My issue is that I don't know which paper to send for remarking. My bad paper was unit 1 which was 76 UMS and my good paper was unit 2 83 UMS.

Unit 1 has a higher chance of going up as there are more questions and more marks to be gained but unit 2 was my stronger paper so the answers are better.

Which one should I send off? I can't do both.

I would say paper 1

But why can't you send off both?

Really expensive for just one mark

How much is each paper, your parents might pay?

How much is each paper, your parents might pay?

I'm afraid unit 1 might bring the marks down though, it was a bad paper. unit 2 has good answers but I feel i got what i deserved for unit 2