About
KnowHowSupply
KnowHowSupply is a small US digital-products business. We sell unofficial study guides and printable tools for exam candidates and for everyday life-admin tasks.
The catalog is five unofficial exam titles — a journeyman electrician calculations workbook, an EPA 608 study guide, a real estate exam math workbook, the CNA Exam Study Guide 2026, and fire alarm / NICET study guides — plus the Holiday Gift Budget Planner 2026 spreadsheet and two humorous how-to guides: How to Make Toast and How to Send an Email.
There is also a free unofficial CNA practice quiz. A paid interactive CNA exam-prep web app is planned. Join the list below if you want an email when it launches.
Disclaimers
Unofficial. All exam-prep content on this site is unofficial study material. It is not issued by an exam vendor, licensing board, or standards body.
Not exam questions. These are not real or recalled exam questions.
Non-affiliation. Not affiliated with Credentia, NNAAP, NCSBN, NICET, NFPA, EPA, or any state board.
AI use. Content and tools were created with AI assistance and source-checked by the creator.
Where to buy
Digital study guides can be bought directly on this site with secure Stripe checkout, or through the Etsy shop and the Payhip store.
CNA app waitlist
Email when the paid interactive CNA study app launches.