Why did i not do my corrections correctly

i apologise for not doing my corrections correctly as i do not konw the correct working.i could not remember the working Mr Wan showed on the board as we could NOT copy down the working and answer. i had to see Iylia's work and do my corrections but there was only a little time left before MT and Iylia was also rushing. i had only some time to copy down the answers but could do the workings. im very s.......(i forgoten not to use the word but i did not use it)....................i apologise and will not do this again. Mr Wan pls forgive me.