I think this is every teacher's goal with tests where you can bring "one sheet of handwritten A4 paper" along as a cheat sheet. The smartass students who don't

I think this is every teacher's goal with tests where you can bring "one sheet of handwritten A4 paper" along as a cheat sheet. The smartass students who don't want to study find ways to cram an incredible amount of information onto these sheets... and through this they end up actually learning much more than if the cheat sheet wasn't an option.