It's often difficult and expensive to find notes online to prepare for the NCA exams.
In Canada, the law of contracts is based on English common law, except for Quebec, where the civil law applies.
I often tell candidates to make use of Canadian Law Students, who often share their notes for free. I have compiled some of those helpful documents for you to access here.
I will continue to add notes as I find them, but definitely make sure you are using the internet to help you understand concepts or cases that you may at times find difficult to understand.