This was posted on another website and I thought I would pass it on here. It is completely free and fairly thorough. Worth a look for some extra hints and such. I am taking my Driving Skills and Pre-trip on Friday and I can use all the help I could get. Hope this helps you too. http://www.thecdltest.com/class_a_complete.html
Don't know what the DMV is like in Tx. But in WA the test wasn't too tuff. 25 questions was all, kinda suprised me. Thought there would be WAY more and WAY harder. I passed after reading the WA State CDL driver's manual, Haz Mat section. You don't have to be a chemist or know the codes, you do have to know about the placarding, safe handling and such.