7 - Trades, Transport & Equipment Operators

Take math, physics and chemistry courses. That's going to help you out, almost no matter what trade you're going to get into. When you're working with refrigerants, you have to understand how different pressures and temperatures correspond to each other.

Reading, writing and working with documents are also skills that you will need every day, whether its reading an electrical schematic, or understanding an operation diagram that tells you how the system is supposed to work. Also, every time you do a job you've got to fill out a service report.