The exchange is your 4-digit grid square (FN20) and Call Sign.
Multipliers are different 3-digit grids (FN2, EN9) on each band.
Score 2 points for PH and 3 points for CW QSOs. PH and CW are separate events.
Score is the total different grids worked on all bands X total QSO points.
Map datafiles required are here.