<p>USN ranking is a mesure of research and faculty reputation. It’s not necessarily a measure of how much you’d get out of the program (though many think there’s a strong correlation). Now to answer your question, Northwestern’s chemistry is ranked in the top-10. Math is ranked in the top-20. Bio and physics are ranked around 20th-30th. If you like Northwestern, you may want to check out their ISP program.</p>