In a large mixing bowl, add pudding mix, cold milk and whisk until combined. It should become smooth and slightly thick.
Gently fold in the Cool Whip until combined. Keep aside.
In a rectangle pan(Dimensions: 9×13), line graham crackers on the bottom to cover the whole pan.
Spoon a third of the pudding/cool whip mixture on top of the crackers and spread gently and evenly with a spatula.
Toss some strawberries on top.
Arrange another layer of graham crackers on top of the strawberries, spread more pudding/cool whip mixture on top, followed by more strawberries.
Arrange a final layer of graham crackers, spread remaining pudding/cool whip mixture on top, followed by remaining strawberries.
Cover and chill in fridge 6-8 hours or overnight to let the filling set.
If you like, you can turn this into a frozen dessert. Wrap the pan in plastic saran wrap first, followed and aluminum foil and then, store it in the freezer overnight. Let it thaw for 30-40 minutes at room temperature and then, slice and enjoy.