Bake yellow cake mix according to directions, in a 13 x 9 inch pan. Let cool. Poke holes through cake with toothpick about 1 inch apart. Prepare 1 small package of strawberry jello with 1 cup boiling water. Let cool and spoon over holes in cake. Refrigerate while mixing pudding. Mix 1 small package instant vanilla pudding with 1 1/2 cups milk. Spread over cake. Refrigerate 15 minutes. Top with Cool Whip. Keep refrigerated.