I tried to do this with prometric and they would only take one code, either 2nd shot or 15%, I went with 2nd shot and didn't need it, playing it safe once again
I have once tried to take my 1st MS exam and register online the 2nd shot exam entering the code given by MS but after that the website did not even tell me it was successfully registered or not.
you register with MS first and get the code, i think it is 2ndfree or something like that. i then called prometric and registered with them in person because the website couldn't accept two codes.
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I have once tried to take my 1st MS exam and register online the 2nd shot exam entering the code given by MS but after that the website did not even tell me it was successfully registered or not.