Questions about JW's "Predestination Calmly Considered"

In JW’s “Predestination Calmly Considered”, I think he disagrees with Calvin’s understanding of double predestination. To JW, the atonement is universal in scope. Christ’s death was sufficient to atone for the sins of the whole world, not only an elect few. To him, human beings work together with God towards salvation. In other words, prevenient grace and human free will (to certain extent) are the two important factors in salvation. God has more glory saving human beings as a free agent, instead of saving human beings irresistibly.

I have two questions on this reading. The first one is JW mentioned in his article that there are two types of divine election: a divine appointment of some particular men to do some particular work (he explicitly mentions that this does not equals to eternal happiness), and a divine appointment of some men to eternal happiness. However, he didn’t really explain these two types in detail. So I was wondering what does he mean by these two types of election and what are the differences between these two types? My other question is that JW mentions that the gentiles are part of the great salvation, but many Jews fall short of it since they could not receive it through faith. I was wondering what’s JW’s perspective on God’s covenant to the Jews? And what is his general opinion on Judaism?