While I have not been invited to the assessment, I feel it is safe to say you should focus more on the operative side of the theory. With this, I mean weather forecasting and METAR/TAF decoding, thunderstorms and fronts, definitions of dry, moist, wet and contaminated runway, air law and ops, especially take off segments, go around segments as well as certification gradient requirements. Good understanding of the relationship between VMCG, V1, VMCA, VR, V2 and how they change according to TORA, TODA, ASDA, balanced condition and so on. I would not expect questions about the ICAO council or tachometers.