double entry VISA - TICKETS

Hi,
I need my inbound and outbound tickets to request it(i'm staying there 3months). That's clear
I am going to travel (to singapore probably) in July (half way through the 3 months) and I am wondering if I also need the tickets to Singapore to request the double entry?? (in total, i'd never exceed 2 months in the country and it would always be below the 3 total months)
Many Thanks,
Joan