I sat the Edexcel Maths GCSE Papers in May and June. For one question, I did not know how to do the question and guessed and answer of 19. I put some random working on the paper in the hope of picking up marks. It turns out that my answer was right (judging from my friends)! However, one of my friends said that I would not get any marks for this question because I got the right answer from the wrong working. He said to check the Edexcel mark schemes as proof. The mark scheme said that 0 marks should be awarded and the response "should be sent to review". Why should the response be sent to review? I am really worrying, so can someone tell me what happens!?!?