If you want to venture into business/management consulting, you don't need to be in business school let alone take business subjects to get a chance. What the recruiters, and hiring managers would often look for are how methodical, analytical, and creative you are in solving problems. They're looking for people that wants to learn, sharpen their skills, and have that discipline to spend the hours working with them on project deliverables. Try to take on some leadership role, it could be something like volunteering, student activities, or anything that you can show that you took lead and achieve the intended results.

Hope this helps.