Some schools have requirements around accepting jobs and following through. It may be an honor code violation by rejecting an internship you accepted. You've a

Some schools have requirements around accepting jobs and following through. It may be an honor code violation by rejecting an internship you accepted. You've already asked for an extension on this company, and asked your higher priority companies to be expedited. When I ended up in your position I did the same. If you can't get the expedited offers you wanted, then you have to decide how much you need this internship. If you're junior or senior year without any other internships under your belt, you need the work experience so take something. Remember, if you hate it, it's only 3 months and you learned what you don't like. If you're freshman/sophomore year, you could do a few more things like research or find other internships (not necessarily related to the job fair). Early March though you're pushing it for this summer, you would either need to find smaller companies with quicker schedules, or may end up with a Fall internship. Would shifting your schedule (school summer, work fall, school spring) be a possibility?