<p>Chemical engineering and electrical engineering seem to be the most work intensive majors. (Edit: beaten)</p>
<p>For biology majors, the pre-med requirements (typically one year of english, physics, calculus, organic chemistry, inorganic chemistry, and biology, with labs in the sciences) can be fulfilled almost entirely within the institute graduation and major requirements. The only exceptions are a physics lab and an organic chemistry lab, both of which can easily be fit into one’s schedule. Chemistry majors can also fulfill the pre-med requirements almost entirely within their major requirements as well; only two terms of biology are needed. </p>
<p>I have a friend who was a pre-med in electrical engineering, but I don’t know how he did it since electrical engineering is known to be an intense major and the intersection of the pre-med requirements and the electrical engineering requirements is 0 (the english, physics, inorganic chemistry, and math can be covered by core requirements).</p>