What is the cheapest and best car insurance?

I live in MA and I want to know what is the best, cheap car insurance out there for this state. I am 17, but I think my mom would put the insurance in her name. IDK yet. I would also be buying a used car from a dealer, if that matters. I just want to know like how much it would be per month. I also did driving school, I heard that lowers the rates..