A plain account of where the money comes from, what this site collects, and the limits of what the tools here can tell you.
How I earn from this
I am the author and publisher of Etched. When you buy a copy, Amazon pays me a royalty on the sale. That is the only way this site earns anything.
Nothing here is sponsored. No company pays to be named, no product is recommended in exchange for anything, and there are no affiliate links anywhere on this site. If a book, tool, or study other than my own is mentioned, it is because I think it is worth your attention.
The free tools are free without conditions. They do not require an address, and using one is not a step in a sales process — the calculator and the blank page ask for nothing at all.
What the inventory is, and is not
I am a registered psychometrician, which is exactly why this needs saying: the Study Habits Inventory on this site is a self-assessment for deciding where to start reading. It is not a standardised psychological test. It has no published norms, it has not been validated against academic outcomes, and it diagnoses nothing.
Read the result as a description of the habits you reported, not as a measurement of your ability. If you are struggling in a way that goes beyond study technique, speak to someone at your school who can help.