Hi George,
Do you know what you want to do with Real Estate? flip, whole sale, buy and hold? Making this much will definitely require a lot of hard work, dedication, and discipline.
DO not wait until after college to get started, you should start saving now. I bought my first property which was a 4 family at age 23 and bought from my savings as a teenager. IF you can have a fair amount saved by time you are done with college you will be ahead..
Based on your post it seems you plan to have a career outside of Real Estate as well as you are currently in school. Keep in mind you may have college debt to pay down upon graduating as well.
More important than figuring out a dollar amount you want to make try to figure out what you want to do in real estate and try to learn as much as you can about it. This will arm you with the knowledge and know how to get started and what direction you want to go in.
best of luck!! Knowledge is power!!
Chris