Approach your instructor and ask for additional help outside the classroom. Sometimes teachers offer supplemental classes for students who are struggling. If this is not possible, don't panic.
Purchase a physics textbook at a grade level lower than yours. Study this textbook and perform all problems. A textbook at a lower level may help you obtain the basic understanding of the physics subjects in order for you to understand physics at your level.
Locate online physics help. There are many websites that offer physics help with homework and tutoring, such as www.physics247.com. There are even websites that offer solutions to specific problems.
Search for a tutor that can come to your home or meet you at a local establishment. There are many tutoring agencies that you can join that hire college graduates who majored in physics. In addition, you can search for private ads for people looking to tutor science with emphasis in physics. This may be more cost effective for you than an agency.