@irontoenail - That's a good suggestion, however I would also add that it is better to be as non-specific as possible early on as you don't know what you are going to end up wanting to do. Keep an eye out for possible jobs and career opportunities. If you completely focus on, say plastics and then find out there was a better opportunity going for someone who specialized in natural materials, you will kick yourself.
On the other hand you don't want to be so general in your studies that you won't be of any use on the job as a product manager.
I would also suggest working in retail while you are studying. There is no better way to develop people skills and if you manage to work your way up to a position of responsibility there, it will speak well to future employers.