Drinking milk will not MAKE you taller, but simply put, it will maximize your genetic height's potential. Say, your max potential for genetic height is 190 cm, if you didn't treat your body good as a child experiencing puberty, you would only reach 180 cm.
However, if you treated your body good fx like consuming dairies and healthy stuff with a good amount of exercise, you will reach your maximum height. Let me keep this clear, there is no way to MAKE yourself grow taller, but there are lots of ways to aid and guide your growth. Milk, for instance, can help to reach your maximum potential for height but it does not work for everyone.