I sometimes had a very small piece of paper scribbled with stuff I couldn't remember while learning but turns out this way I knew what I had written down there and didn't need it afterall :D

One time I accidentally forgot about that tiny paper though and my teacher actually found it on some stairs and recognized my handwriting.

Our history teacher would give anyone who submitted a good cheatsheet (meaning good info, small form factor) for the test beforehand an automatic pass (but no higher than a passing grade), though you can’t take the test for a higher grade.

The best cheating I ever saw in highschool/university was:

1. written on the brim of a hat sitting on the table. Guy would "fiddle" with it while "thinking hard".

2. guy peeled off a water bottle label, wrote on it, and stuck it back. You could read the notes through the bottle, but they were faint enough it wasn't too obvious waking by.

Pretty much no professor in college checked your TI calculator for any malfeasance.

Many classmates I knew in engineering, physics, and mathematic classes would place notes in the programming parameters using windows software