As Mr Ripley says, it helps if you get along with your partner, as CRM is obviously a large component of what BA are assessing. The assessor also will throw in some mental arithmetic questions just as you are under the highest workload as well (ie just when entering a hold or joining a localiser) such as 'if you are burning 1700 kg an hour what is your endurance if you have 6 tonnes of fuel' or 'how long will it take to climb from FL90 to FL350 at 1700fpm.