Welcome Iseenow !
I am in the U.K, i live in Mid-Kent, I was born-in in 1950, baptised at 12 and stayed in until 2008. as you can imagine I am a bit of an authority on JW's and the WT organization.
I assure you, I have never come across a prophecy that they actually made that came true. not one. I have had Elders tell me all sorts of things, but they are simply not true, they are repeating the half-truths they have been fed.
Do not do the work yourself, say to this Elder that you want him to show you actual copies of their prophecies. Say "You don't want me visiting those dodgy sites again do you ?"
As to 1914 for instance, look at what was actually said and it is nothing like they pretend, the same with the U.N popping up after WW2, the first instance of a mention of this is by N.H Knorr the president of the WT at the time, some months after it was announced in the press !
And so on, please investigate it all before giving them power over your actions and very thoughts.
If you want to know anything more, post here, or P.M me
Welcome again !