Beat the mascarpone with a mixer in a large bowl. Add the condensed milk and beaten to snow cream to it. Stir well using a wooden spoon.
Set the cream mixture aside. Bring the milk to a boil. Start assembling the cake after dipping each biscuit in the milk.
Arrange the biscuits in a rectangular tray, pour 1/2 the cream mixture over them and distribute the strawberry jam evenly. Arrange a 2nd layer of biscuits, pour on the rest of the cream mixture.
Decorate with fresh strawberries and put in the fridge for a few hours to harden.