I think that you have answered your own question, Wushu: 'That goes against my work habits and basically my life. ' There's nothing wrong with you, but you'll have to get up to speed. Getting into university is competitive, and one of the basic keys is good marks on the SAT.
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Does it matter how long your work takes, as long as you get it done? In most businesses, the answer is 'yes'-- and you will not have your job long if you cannot work to deadlines.