两本指南,一次结账

CSLB Law & Business — Complete Study Guide (2026)

All 7 exam sections, written to current 2026 law — the numbers the outdated books still get wrong. PDF + EPUB.

CSLB C-20 HVAC Trade Exam Study Guide (2026)

The C-20 trade exam asks a working installer to prove it on paper. This guide covers load and duct design, installation practice, the refrigeration cycle through the A2L transition, diagnostics, and the code and safety rules — with the numbers that move each code cycle flagged rather than stated as permanent. PDF + EPUB.