JWs are divided on two classes. The noble one, represented by 144K and the Great Crowd of plebs. Only 144K are saved through blood of Jesus by partaking during the Passover. These anointed believe that they are chosen by Jehovah and will go to Heaven where they will be his spiritual bride and Jerusalem. Rest of humanity is destroyed in Armageddon unless they belong to Great Crowd and will ride through destruction as did Noah family on the Arc. JWs believe that their salvation is secured by association with the 144K and WT; but this faith is accompanied by deeds which means field work, and distribution of WT literature.
Issue of salvation in JW theology is really weird and does not make any sense unlike in other religions, where people are saved by faith. The salvation does not mean afterlife, JWs believe earthly existence, and thus salvation = surviving Armageddon. During resurrection phase, bad and good people will get another chance during 1000 years reign before another test that would eventually pave a way to earthly paradise. So you are not off the hook when you die nor when you survive Armageddon.