PSLE (maths)

haiz.... although i manage to do the whole maths paper, i lose about 15 marks liao.i'm so sad sia. Nvm some of my friends are worst, they lose about 20 marks liao ..... i dun wish to say the names but those who know them should know. why why why ??? mus PSLE be so diffcult can't it be easier??? Nvm over liao regret also no use. The only thing i hope is the tees score will be higher.