My vitamin B12 is 763 and it's suppose to be from 198-615. Is this bad and what does this mean? 24 y/o female. I don't take any supplements/vitamins.

That's fine. Reference ranges are set to reflect where most healthy people fall. Some folks have extra B12-carrying protein and hence a higher B12 level in the blood, or you might have recently taken some B12 perhaps without knowing it. If you are otherwise well and your basic labwork isn't otherwise WAY off, this is never a problem.
It's fine. It's not a problem if your vitamin B12 is slightly high, since there's no toxicity. You probably just eat a healthy diet.