CDL questions?

Studying the book here in Missouri to obtain my class A CDL with air brakes and HAZMAT endorsement. Any of you that has one may have suggestions for me on either the written or driving skills portion. What did you guys or gals have trouble with? What should i take special note of? Any and all suggestions would be greatly appriciated. Now back to studyin. I plan on taking the test this wednesday. Advice is appriciated. Thanks
Small Block