Do Jehovah's witnesses believe only THEY will survive the Great Tribulation?

Just like the account of the Israelites being backed into a corner at the Red Sea, we as Jehovah's Witnesses firmly believe that we will receive a similar salvation by Jehovah when the great tribulation breaks out. Whether some die at that time or not, Jehovah will see to it that his people (as a whole) will make it through. What we don't know for sure, is what will happen with the millions of people who may at that time be studying the Bible with Jehovah's Witnesses. Jehovah is the reader of hearts, as we know, and he will be able to discern whether some of them will have already made the choice in their heart to keep learning about him, or if they're wasting the time of the one studying with them. Quite possibly, some who are just studying may survive the great tribulation as well.