A template for creating memory sheet permitted in exams with customizable grids (for me, I wanted 0.25 cm grids)
You might want to turn off page numbers or the credits, if your printer doesn't support borderless printing.
I recommend these pens for writing on the sheet, as they are the smallest I could find (no this is not an affiliate link): https://amzn.eu/d/hPTl6ck
Here is a preview of the template, with watermark, page numbers and credits turned on:
Here is an example I used during an actual exam:
Nowadays, I also like to use colors, to make the sheet more readable and to make it easier to find things.