Study chapter 15 of the regular Texas drivers handbook (14 in the CDL manual). This is not a commercial test.
You can review the sample questions for this area in the manual.
Amateur Radio Operator (KE5DFR)|Full-Time! - 2012 6.7L Ford Crew Cab Dually -2013 HitchHiker Champagne 38RLRSB - Travel with one Standard Schnauzer and one small Timneh African Gray Parrot