1 pkg. (2-layer size) white cake mix
1 pkg. (3 oz.) JELL-O Strawberry Flavor Gelatin
1 cup quartered fresh strawberries
1/2 cup each fresh blueberries, blackberries and raspberries
1 Tbsp. KOOL-AID Strawberry Flavor Sugar-Sweetened Drink Mix
2 cups thawed COOL WHIP Whipped Topping