Reviews on C2 SAT course?

I’m going into my senior year and am trying to raise my SAT score of 1680 to at least a 1900 or higher. I was looking into C2 but I wasn’t sure I should go with them instead of another program such as Princeton review or other program. Has anyone had any experience with them?

Do not go with Princeton Review. There are much more efficient ways to prep. I’m not sure about C2, but I think I remember some bad reviews here. Try a search.