I have been teaching with RevolutionPrep for more than 7 years and can endorse our company with no reservations. Private tutoring is an investment, but we also offer affordable on-line group classes that are very, very effective. Our on-line small group classes (up to 6 students) are the same price as an in-person class, and our larger on-line course (up to 20 students) are even more affordable. I was a very late convert to the on-line platform but our test results show time and again that it is as effective and for many students, more effective, than an in-person class. Classes are taught live by a real teacher in real time via webcam and microphone and students adapt really quickly to using the virtual classroom. That might be a good option if your school district doesn't offer a high-quality, affordable class.
Message me if you want any info on RevolutionPrep in particular or test prep in general and I'd be happy to share what I know!