Turbine pilots manual. Any aviation weather book. Know your systems for the most complex a/c you fly. Jepp plates, and all things ifr. Get together with other pilots/cfi's and learn from eachother. Professional prep a few months before the interview, to include crm and sim training. Congrats to yourself for trying to improve. While others are wallowing in self pity, you will be ready to go when the dam breaks.