<p>I took courses with students from MIT (no summer session) and graduate students.</p>
<p>It had 3 MIT Students, 5 or so grad students, 12-16 undergrad students (mostly Harvard) and 7 high school students.</p>
<p>There are classes that are entirely or predominantly taken by high school students (Calc 2 or Multi), but I wanted to take one that would be more of a challenge.</p>
<p>It may not be as prestigious as other places, but if you want to get the feel of an undergraduate experience, with all of the rigor, go for it.</p>
<p>Last summer Harvard Summer School and the Secondary School Program (SSP) were used interchangeably.</p>
<p>So, If I were you I would look at their courses, pick the most difficult one in the field you are interested in. Whether it is programming, O-chem, or the arts.</p>
<p>I got financial aid for about 70% of the costs as well.</p>