My friend did the test I did today a few days ago, and consequently, already had her results/answers. She gave me the answers and questions to look through. I revised them for about half an hour before the test and went and did it.

To be honest, i haven't got the best memory, so it didn't really help at the time... or so i thought.

End of lesson, we swapped our tests for marking. The boy i swapped with (who also supposedly already had the answers) said I had a really high mark - only a few off full marks. The thing is, i'm not sure if he was lying just so it was easier for him to mark.

I ended up with the highest mark in the class, and feel unbelievably guilty. Help? I feel like such a fucktard.