People naturally work harder at things they enjoy or are interested in, period. One mistake people often make is assuming, quite stubbornly, that what they studied for is what they'll enjoy working as in the future. This is not always the case! It can be tricky working out which jobs you'll find interesting and challenging, and you might find doing a few internships helpful for your realisation. If you do manage to score a career in something that you know you'd do for free anyway, you've hit the jackpot! Your shifts will fly by and you'll wonder how you're able to get so much done.