BEAT pudding mixes and 3-1/2 cups milk in large bowl with whisk 2 min. Let stand 5 min.
ARRANGE 11 wafers on bottom and up side of 2-qt. serving bowl; drizzle with 1 Tbsp. of the remaining milk. Add layers of 1/3 each of the bananas and pudding. Repeat layers twice. Cover with COOL WHIP.
REFRIGERATE 3 hours.