Section C – Please Help

Does anyone know how strict ACCA are in regards to presentation of Section C questions?

For example, if you are asked to complete a number of difference variance questions will it have to be a specific format or as long as it is clear for the examiner it is okay?

For example, with the variances do they have to be minus if it relates to an adverse variance and has to be plus for a favourable variance? Do you have to make it clear which is adverse and which is favourable by writing it next to the total variance?

Thanks.