Not really.
First off, you wont be getting 12 hours a day right off the bat. Its a very hard field to break into these days. And if you do get hired, you will start off with doing basics such as oil changes, tire changes, cleaning equipment, sweeping and then progressing from there.
You will learn at a faster rate if you obeserve other techs and ask many questions. Dont go in thinking you know everything.
And as for booking hours, it will dependant on if they start you as flate rate (which i doubt) and remember when you make mistakes, you will loose time on that vehicle.
I would highly recommend continung your education and taking all the ASE tests now. Then once you have 2 years experience, you will get your ASE credentials.