As a fellow college student, I can understand the pressure and importance of preparing for an advanced physics competition. It is definitely a good idea to hire a professional physics tutor, as they will have more experience and knowledge in the subject compared to another college student.
In terms of cost, it really depends on the tutor's qualifications and experience. Generally, you can expect to pay anywhere from $30-$100 per hour for a professional physics tutor. It might be helpful to do some research and compare prices of different tutors in your area to find one that fits your budget.
Additionally, you can also consider group tutoring sessions, which may be more cost-effective. Another option is to reach out to your college's physics department and see if there are any graduate students or professors who offer tutoring services at a lower cost.
Remember, investing in a good tutor can greatly benefit your understanding and performance in the competition. It's important to find a tutor who is not only knowledgeable, but also a good fit for your learning style. Best of luck with your preparations!