Let's say you are hypothesizing. And you say:
I must have great accuracy in English, and if I don't, all the efforts I put in would/could/may just go to waste.
In this sentence, I know would is possible, but so are could and may because it is more likely to happen. I know how to use modals, but in this situation, it really winds me up!
Could you tell me if all are equally possible, or is there a best modal that should be used?