How to make the most of a third paycheque windfall

Q: Since moving in together and combining our finances, my girlfriend and I have been setting mini goals to help us stay on track while we pay down our student loans and other debt from school. It’s become a bit of a game we play. She is paid every second Tuesday, which gives her three pay periods this September, and I’m paid biweekly on Fridays, so I’ll have three paycheques in October. Normally, we just let that extra money sit in our chequing account, but this time we want t