Bank Valuation Model

Hi collegues, hope you all well on your way to beat level 3 in June, success for everybody! I am going to hold only level 2 in June. I worked hard and finally created a bank valuation model from scratch but still it’s forecasting accuracy leaves much to be desired. I am not an expert in building strong models so I decided to L3 candidates as I assume you more experienced in that. What you can advise me, perhaps you can suggest some materials? Thanks in advace! JIC my mail: