Hi I have a tiny bladder and also I am constantly dehydrated so not drinking water 3 hours before is almost impossible for me. From my experience, the more I drink on a daily basis, the more my body needs to feel hydrated.

I drink a small amount of coconut water before I take a practice test and during the break, and also remind myself that I CAN control my bladder. Oh and if you're a big coffee drinker, try espresso shots instead of water downed coffee which will make you pee more I think?

Definitely not scientifically proven but someone told me you get 3 signals from your bladder when you need to pee until you really can't hold it in anymore. When I feel like I need to pee I remind myself I have 2 more "signals" left lol.

Good luck on bladder controlling!