Hola Rinceluis,
Please don't worry because exactly the same happened to me 1 month ago. I only had to complete the online checking test as there doesn't seem to be any arithmetic at this stage in the process and you should hear the results via email within 1 week. I am due to go to Swanick for stage 1 next Thursday..eek!
I'm sure you will be fine and with be able to book your stage 1 soon.
Good luck!