The law doesn't require ASE certification, but many auto shops require it. Currently, 385,000 automotive professionals possess certification. In order to become certified, you need to pass at least one field test and document two years of relevant work experience.
The official ASE website contains test catalogues that outline the requirements of each area of certified expertise, as well as an interactive tutorial.
The ASE awards a variety of certifications to its successful examinees. The training catalogues outline test breakdowns and sample questions.
The ASE online tutorials provide you with step-by-step study guides followed by a subsequent quiz to test your knowledge. You'll need to create an account with ASE as well as purchase vouchers in order to take advantage of them.