Under the BHMA/ANSI 156.50 standard there is cycle testing, some security testing, and other use and performance testing. There is a 10 minute pick resistance test in this standard and a strength test against plug pulling and torquing. But this is really just a durability and usage standard.
The BHMA/ANSI 156.30 is the real security standard, and has Levels A,B,& C, so as not to be confused with the Grades 1,2,& 3 of the 156.50 standard.
I have never seen any statement about the actual Grade of the Keymark locks, but I would guess it would be Grade 1 for general durability and usage testing. Comparing the Keymark cylinders against other cylinders, I know are Grade 1, it appears to be manufactured just as well as those locks and even as well as the Biaxial and M3 cylinders.
I do know that the Keymark's entire model is based around "Key Control" and a package that will retrofit other SFIC. Also the Keymark does not meet UL 437 or BHMA/ANSI 156.30.