when writing of paper of Ipcc examination it is allowed to interchange the sub question ??? example- q(1) (b),( a), (c),( d) or mandatory follow chronological order like-q(1)(a), (b), (c), (d).
Even main question can be written in any order. But, all subquestions in one place. Example, starting with Q1, (a)(c)(d)(b) and then Q6, (b)(c)(d)(a). The question numbering must be very clear. Presenting every sub question in a new page would be good.