I would suspect that it is a straight level 3 rated for .308 ball type rounds (can't say for sure though seeing as it's European, and 20-years since issue). If it was a 3A it probably wouldn't be a ceramic composite, and 3+ plates seem to be a newer trend in armor to stop specific common military rounds that aren't AP. Level 4 or (IV) supplying protection for many AP rounds, but generally the tradeoff is much higher weight and/or thickness.
If you need a shooters cut, then you might want to search for other options, as modifying a composite plate (or really any plate) without destroying it would probably be difficult. If nothing else, since these aren't shooter cut, these would probably make great back plates or insert plates for a backpack as well.