Mechanics is not a difficult course to be honest, but to pass it with a high average, you should practice. Solve as many problems as you can and you'll ace this class no matter who your teacher is. Céline Lebel is one of the finest teachers of this course. She is really thoughtful and her notes are strongly useful for the final. The level of difficulty of her tests and quizzes is usually the same as the final, but she also solves more challenging questions in class (which are always given in her powerpoints). I also suggest that you purchase Mastering Physics.