Meanwhile, cook pasta as directed on package, omitting salt. While pasta is cooking, heat oil in large skillet on medium heat. Add garlic; cook and stir 1 min. Whisk in flour; cook and stir 1 min. Gradually whisk in milk; cook and stir 3 to 5 min. or until thickened. Add 1-1/4 cups shredded cheese and 3 Tbsp. Parmesan; cook and stir 1 to 2 min. or until shredded cheese is melted. Remove from heat.