Anybody know a good SAT prep place in manhattan, ny?

i hear that the kaplan, princeton review, etc places arent very good. so if u know of any other places, it would be great. i want to go to a place that has higher standards and i dont care whether or not its diverse racially. i would prefer places that have saturday courses because my weekdays during the school yr are pretty packed already. (disregard pricing for now please) any and all suggestions will be appreciated. thanx! :)