everytime i get gas during the semester i keep the receipts
just in case to add it all up to deduct it from the income on my end of year tax return
(this only applies if you end up with extra money after tuition)
it'd be wise to keep any money spent on laptops, books, etc just in case.
...to deduct it
otherwise the extra money that you kept from grants and scholarships will be taxed
of course if scholarships and grants dont cover all of your tuition...it really doesnt matter