As maths P1 9709 resit query

Can someone tell me this if they knowthis for sure .

can i do parts of answers separately on answer booklet ? obv mentioning each w and it's respective marks BC I feel risking to leave space for coming to that part later will create more chaos inside the answer sheet if space isn't sufficient enough when I come back to solve it later.

Genuinely concerned what if they don't check without ordered parts 😟