I have a degree in Biological Engineering from Purdue University, but I focused on taking pre-med courses while in school to prepare me for the MCAT exam.
While looking at med schools, I noticed that some prefer students with traditional pre-med degrees, such as biology, chemistry, etc. Other schools preferred students with non-traditional degrees, such as engineering.
As far as electives go, I'd recommend lots of organic chemistry (this was an elective for me) as well as psychology, a foreign language, and anatomy. Back in my day, anatomy wasn't required for pre-med but it helped out a ton on the MCAT exam.
I decided that I wanted to go into the pharmaceutical industry instead of medical school in the end, but I still get to impact patient's lives every day. Good luck and study hard!
**As a last note: start with the requirements and make a headway because the recommended courses, the sciences more specifically, build off the required courses. For example taking Bio will help build a solid foundation in understanding genetics and cell and molecular.
Best of luck!
Continued success in your endeavors.
If you are looking to go pre-med I would focus a lot of your electives in the science realm, specifically biology and chemistry. Classes like cell bio, organic chemistry, anatomy, and so on will best prepare you to take the MCAT post graduation. I know this may not sound like the most fun choice, but if you want to go to medical school and want to pass the MCAT first try I would definitely stay within science.