You’ll need to study. You will have course materials supplied by your instructors. If you are not currently in a technical training program, the bookstore at your nearest training provider is a great resource. Call or visit and ask what resources apprentices are using and if you can purchase them.
Visit your trades program page for a list of training providers, or the Program Outline which contains a list of Recommended Resources that may help with your studies.
Preparing for Red Seal exams
The Red Seal website is a great place to start. Check out the exam breakdowns, practice questions, or National Occupational Analysis (NOA) section for your trade.
ITA has practice exams for seven Red Seal Trades: