I'm thinking of running up massive bills
Why are you running up massive bills?
I want to see how much I can spend before the next month
You should pay your bills on time so you won't be behind. Waiting until the last minute can create debt for you.
I just want to see how far can I go.
I think it's smarter to just do this hypothetically, like a simulator so you don't actually lose any money! Having credit cards and bills is a massive responsibility, don't you want to be financially secure in the future, because having bad credit can affect loans.