ReadyAPI certification

Dear,

I will probably try to do the ReadyAPI certification soon.

- I know you have two attempts to pass it. But what if you fail twice? Then it is game-over or can you re-buy it and re-do it twice more?

- Suppose I buy the ReadyAPI On-Demand Video Training + certification TODAY. How much time do I have to do the exam? 1 month? A year? Unlimited in time? 

Thanks in advance for the responses