If you are a student, your teachers or counselors will be able to help you select classes to prepare for apprenticeship. With their guidance you can plan course work to obtain the skills in mathematics (specifically Geometry and Trigonometry), reading comprehension and basic science. These skills are necessary to be successful in an apprenticing profession.
In most instances, a great deal of time and money is required to prepare for your career. In a registered apprenticeship you can actually earn while you learn your chosen occupation.