Well, good luck then, you can format your drive 5 times, its still possible to extract info.
You can turn off your computer, I can still recover data from your RAM, yes RAM.
While it's possible, it's not realistic nor probable in this case.
Whatever loaded on RAM in 2013 already overwritten and we've no idea how the drive formatted or how the drive is used (often out of space, used as swap, regularly store then move data, etc.)