Do jws believe that they are the only ones who will be saved?

No, we do not believe that we are the only ones that will be saved. Anyone who is following the bible accurately and worshiping god in the way that he approves will be saved. Just because we are called "Jehovah's Witnesses" doesnt mean we are saved. The name "Jehovah's Witnesses" is just to clify a group of people that follow the bible and worship god accurately and properly, since we want to be among others who truly follow the bible for encouragement. Also because bad ociation spoils useful habits. (1 Corinthians 15:33)