For a CAT practical examination the skills examined should have been converted into procedural memory in the minds of the learners.
Procedural memory is a type of long-term memory of how to perform different actions, procedures and skills, e.g. riding a bicycle. This is "know how" memory. When needed, procedural memories are automatically retrieved and utilized for the execution of the integrated procedures involved in both cognitive and motorskills (Wikipedia).
Procedural memory is created through "procedural learning" or, repeating a complex activity over and over again until one figures out how to make all of the relevant neural systems work together to automatically produce the activity.
So learners should go over old practical examination papers before writing the final paper, as well as thoroughly repeat those complex procedures during the year.