querie about answering costing questions

greetings!,

i have a long due querie regarding answering costing questions in examz.. i'm in a habbit of writing down the summary of the question while reading it ( i'm sure many would be doing the same coz the questions are soo damn complex!). so what do i do? is it allowed to make notes and then start answering the questions or will it be best to do the summary portion on the last page of the answer book?? coz i don't think they ever give an extra sheet right at the start of exam... plz guide

thanks!!