D1.1 code book for CWI Part C: which edition to buy

Which edition does Part C use?

AWS's D1.1 exam description says the 2020 edition stayed acceptable through 31 Dec 2025. From 2026, candidates study 2025, and that includes 2026 retests and candidates taking D1.1 as their first Part C exam. Some older AWS pages still list 2020; the D1.1 exam description is the one that sets the switch date.

Part C tests applying the code, not reciting it. The Part C guide covers the exam itself. If this is another attempt, the retest guide explains why you stay on the same code.

D1.1 code book 2015, 2020 or 2025?

• 2025: the D1.1 code book for Part C exams in 2026, retests included. AWS sells it as D1.1/D1.1M:2025-AMD1.
• 2020: accepted only through 31 Dec 2025. It's the wrong book for a 2026 exam, and clause and table numbers can differ from 2025, so lookups you drill in it won't land in the same place on screen.
• 2015: older than 2020, so it's the wrong book for a 2026 exam too. Old prep material and used listings still carry it.

Part C rewards finding a clause by its number fast, so drill in the edition you'll see on exam day.

Where to buy the D1.1 code book

The AWS publications store lists D1.1/D1.1M:2025-AMD1. Start there when you compare any D1.1 code book for sale, and match the full designation, language, format and edition before you order. On a used copy, check the edition year before you pay. A cheap listing is no bargain if it ships the wrong edition. Add the book to your budget alongside the exam fee and travel in the CWI cost guide.

The on-screen code, and printed copies

AWS recommends getting fluent with the PDF's bookmarks. Prometric can disable some PDF navigation features, and word search is off. So practice with bookmarks, and also be able to reach any clause by its number without searching.

AWS says printed code books are not allowed for certain Prometric exams, while its D1.1 description covers a printed, permanently bound copy where one is permitted. If you want to take a printed copy in, check your booking instructions first. Either way, a printed copy is the best thing to study from.

Learn the clause structure, then drill the route

Start with the contents in your own 2025 book. Add a few clear clause-number tabs using the exact numbering printed there, for example 4, 5, 6, 7 and 8, wherever those clauses begin in your copy. Keep the labels numerical. We don't reproduce clause text. Our D1.1 clause map says in plain words what each of the eleven clauses covers.

Open the closed book to each numbered clause. If tabs hide each other, move or cut them. Add finer labels only when practice shows a broad tab leaves too much page turning. A dense fringe of tabs slows you down, because every label becomes equally hard to see.

Keep a study log of the topic, the clause number you found and how long it took to get there. Keep the log out of your exam materials. Repeat slow lookups from the contents or index, not from a remembered page. Then read the provision and check any cross-reference before deciding you're in the right place.

Drill with PDF bookmarks too, as AWS recommends. The habit that pays off on screen is the same one as on paper: pick a starting point, go to the numbered clause, and confirm the reference. Time yourself on the five clause-finding items in our CWI Part C practice test to see how fast your route is.

Check the appointment before packing

Bring current government-issued ID and your printed AWS exam confirmation letter. Check the permitted materials for your own exam rather than borrowing another candidate's packing list.

Find your navigation gaps with the free 10-question check

Take the free 10-question Part C check. For every miss, note whether you started in the wrong clause, lost time between references or misread the clause once you found it. That tells you exactly what to drill next. When you're ready for the full prep, the Part C course gives you code-navigation drills for finding the right D1.1 clause, table or figure fast with bookmarks and clause numbers, a lesson for every exam subject, two full-length timed practice exams, and a worked explanation with every answer.

FAQ

Which D1.1 code book do I need for the CWI exam?

For Part C in 2026, the 2025 edition, listed in the AWS store as D1.1/D1.1M:2025-AMD1. Part A is closed book, with no code book at all.

Can I use a 2020 D1.1 code book for CWI Part C?

Not in 2026. AWS accepted the 2020 edition through 31 Dec 2025. Exams in 2026, retests included, use the 2025 edition.

Can I bring my D1.1 code book into the exam?

Only where your exam allows a printed copy, and then it must be an original printed publication or a permanently bound copy. For some Prometric exams the code is an on-screen PDF with word search off instead. Your booking instructions tell you which applies.

Does Fillet Gauge supply the D1.1 code book?

No. You need your own licensed copy, and the AWS store is the place to start. Our drills and course cite clause numbers only and send you to your own book for the text.

Sources

Show the list

• D1.1 Endorsement Description, AWS, revision 14 Oct 2025, pages 2 and 5. Retrieved 17 Oct 2026.
• D1.1/D1.1M:2025-AMD1 store listing, AWS. Retrieved 17 Oct 2026.
• CWI Examination User Guide, AWS, revision 4 Sep 2026, pages 11 and 13 to 15. Retrieved 17 Oct 2026.