Couple of points:
School education thesis:
2 - ( Buy some time) there are tools dedicated to helping amend incorrect file names. If you need more time for a paper, its generally best to just ask for it.
3 - (Get your thumb drive back) this is plain bad advice. Firstly you can only use it if you haven't lost it yet; secondly it won't work at all if the thumbdrive is deliberately stolen, which happens.
So here's an advice that will prevent it from happening. Get a small pouch with a carabiner clip, like a soft camera case. Pick something that you like the look of, the plan involves owning this for quite some time.
Inside it attach (sew/superglue/hotglue/
Finally attach any USB keys to the keyring, and clip this carabiner into a rucksack, satchel or handbag - and leave it clipped there, permanently glue if necessary. Some rucksacks have elastic loops for holding pens nearest their zips, so consider using one of them for this.
I know people who have tried using a retractable keyring attached to a trouser pocket and it was so bothersome they gave up on it. They were not at all happy to lose their USB sticks afterwards. The extra complication of doing it this way means you're using stuff you like the look of, you always know which bag has your USB stick and exactly where in it is is and you don't quit a good habit because its gotten inconvenient.