Texas DMV for license-Wharton?

So I heard that if you go early, Wharton DMV will let you take your driving test to get your license then and there without having to make an appointment for a month later. I also heard they don't even make you parallel park? Can anyone give me more information on this? I live outside of Houston so if I'd like to know the best place to go, when, and what each one makes you go through, or just whatever you know. Thanks!