Memorizing material the day before a test (the day of for some) and completely forgetting all the information exactly after the test is taken, or sometimes even before.
Oh crap the test is tomorrow! I guess I should study. I wonder what chapters it's on.
To trick ones self into believing that by actually going over your "school" notes it will infact help you in the long term, but instead you just look at all the dumb shit your mates have written on the back of your text book.
me: mum im gonna do some study!
mum: whatever just be back by next week!