H endorsement: placarding, shipping papers and the segregation table.
Most Hazardous Materials questions are the same federal material in every state. 3 questions in the app are written for Michigan alone, from the Michigan Commercial Driver's License Manual (2005 CDL Testing System, Rev. 03/24).
You may keep using the existing endorsement until the licence expires. A same-day retake needs the branch manager's approval; otherwise you may renew without hazmat and add it later for an $18 correction fee plus $5.
The hazmat test is 30 written multiple-choice questions, 80 percent to pass, and an oral version is not permitted.
One example, answer shown. Practicing the rest happens in the app.
Table 2 materials need placards once the aggregate gross weight, including packaging, reaches 1,001 pounds. Table 1 materials must be placarded in any amount.