Well I'm not sure how it works over there but I would say... -Make sure you're on time to class.
-Keep up with the notes.
-If you have a locker, put the stuff you don't need in there to lighten your workload, and then when you need it, take it out.
-Organize your stuff needed for the next day the night before, so you don't forget anything, which includes whatever you're going to wear so you have more time in the morning.
-One subject per folder/exercise book.
-Make sure you have pens/pencils/ruler/correction fluid/calculator/whatever else you need, as well as paper (if using a folder).
That's all I can think of at the moment
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Life is really like a box of chocolates
Some of us are left with the turkish delights