It's gonna be horrible going into physics with no prior learning.. It's too late as well. I didn't take the prerequisite for Grade 12 Physics so I can't take that. Meaning, I can take it in University but not in high school.
Isn't it spelled principal? principle - A fundamental truth or proposition that serves as the foundation for a system of belief or behavior or for a chain of reasoning. principal - Adjective: First in order of importance; main. Noun: The person with the highest authority or most important position in an organization.