someone in my organisation shared with us how she started selling undies for female while in school,She took those female products to the female hostels at her leasure time to sell, and for her restock she does her purchase from a nearby city,and this did not affect her studies,this was way before social media became popular though.She kept progresing and today she owns an educational institution,because she studied education in school.Exactly, the important thing is time management, and the desire to work while studying. Many have more time available than others, however, they will always find an excuse, simply because they have no interest in it.