having had a good nights sleep and make sure you have had a good breakfast
And translated this means keep off the coke and cafeine in the evening. Relax and don't get hyper. Don't disturb others who may have gone to bed earlier.
One thing to remember in all the tests - you are NOT in competition with the other candidates that day. You are in competiton with ALL the candidates who are awaiting selection now or in the future against the numbers needed.
At OASC, one of the things you will be assessed on is your 'followership'
abilities. Are you a team player? One in a hundred may be selected as a prima donna but the majority must be competent all-round team players.
If you are tired and yawning don't expect any favours.