I used to always do large projects on the second to last night before they're due. Though I recall one time in elementary school where I did my entire sixth grade project on Guam in one night.
Nowadays, I'll start on the second to last night, go to bed, and try to finish them the night before they're due, unless, of course I get them done in study hall.
I always get above average grades though, although math and science have been slipping. Not too bad though when the only people I know who get straight As in every course are overachievers who spend every moment trying to please the teacher, so they can get good grades and get into Harvard (or Cornell), or math geeks (since teachers in social studies, English, and World Language, where I do well, are far more lenient than math and science teachers generally are).
As for tests: until last year I always aced them in every subject, so what point in studying?
Then I got a B- and a C on some Chemistry tests. . .
I still only have to study for science tests though, so far anywhen. Damn formulas and statistics.
I, unfortunately, am one of those students with I higly retentive memory and a deep well of background information.
Since as a result I never had to work, it's since begun to catch up with me in some classes, and actually working and expending more than a half hour of my time for any class to get As is a difficult adjustment (well, I did adjust to an hour of useless busiwork in math in middle school, but aside from that. . .)